Year	Number
1979	273694
2005	2523947
2007	2746447
2008	2788094
2009	2881941
2010	3036438
2011	3040858
2012	3056092
2013	3223229
2014	3235009
2015	3296583
2016	3138388
2017	3018924
2018	3087264