So it's something that we're watching incredibly carefully. We're continuing to execute well against our strategic plans and our global opportunity and believe we're well-positioned for sustained, strong, top and bottom-line growth and increasing profitability. Slide 6 highlights key marketing and product projected at Tinder that support our overall strategy. With the newest update, you can now narrow down the minimum age and get more matches with the expanded settings. And last year, more than 44 million matches were made on Dating Sunday.
But I think there's still more room on that front, and that will help drive. We have an extensive road map for the feed and post-match experience, so stay tuned. According to data by Tinder, there are 1. We've expanded margins by five points over the three years, with an exceptional 2. In 2018, Tinder added 1.
On Slide 14, you can see from the left chart that our leverage has declined noticeably over the last three years from over 4 times to about 2 times. A left swipe means you reject the person and swipe right means you can match with that profile. There is a premium Tinder app which offers extra features but the user has to pay to get it. Our portfolio strategy and continued emphasis on launching in new apps has and will continue to pay dividends. It's not confined to one particular geography, which I think was the last part of your question.
Right now, our focus is on driving user growth by raising awareness, driving downloads, increasing product affinity. So we don't think about a single competitor. And I think you could imagine a much broader, longer menu of à la carte features that could be appealing at Tinder. So as you know, we talked a lot about the large number of expiring six and 12-month packages that we had in Q4 when we had our last call. And we'll start to see that sequential improvement in revenue growth on a year-over-year basis as we get through '19.
The young generation feels excited when they meet new people with Tinder. Imagine that you are listening to workout music while jogging, but finish exercising during the middle of a song. Previously, users could choose in their settings to allow others to find them via their contact details. And so as a result of that strong product traction, we're seeing organic growth in large cities, cosmopolitan cities, throughout the U. Tinder has always been the go-to dating app for most iPhone users.
. If the Match and Meetic turnarounds progress faster than what we're currently anticipating, you could see upside to that number. Primarily, due to the many creeps that inhabit the Tinder ecosystem, the abuse of the platform is also rampant. Japan is a really interesting example of this. Feels weird that undo wouldn't be checked on the server side though, seeing as it's a premium feature.
And how social media and dating apps usage maybe different in emerging markets? You know, rude behavior like. The benefits of small optimizations, such as PayWall tweaks or recommendation engine changes that we made in the quarter, give us confidence that we have much more headroom on this front in 2019. Simply follow the instructions below. The heart of OkCupid's growth in the U. Im using an adafruit trinket for a 5v power supply Lego Robotics Limited on resources and making use with what I already have, I choose a Lego Mindstorms motor to act as the physical controller that can toggle the light switch. A separate power source other than the Pi helps to avoid server problems and interference. Tinder got its start on college campuses, and last year, the launch of Tinder U meaningful increased engagement and usage within Tinder's core demographic.
So it's not always spending a lot of dollars that drive traction, but just spending them in a really smart way. So we have a number of bets that we've made that we think will be able to drive growth for us aside from Tinder. So you're probably going to see that trend that you're referring to on the North America subs persist for a quarter or two as we make those changes at Match. As a market leader for over 20 years with a portfolio of iconic brands around the world, our energies are focused on expanding category penetration, just as Tinder did for a generation of younger users. We're replicating that formula now in India by adding localized questions that resonate with young and increasingly progressive Indian population.