Year	Number
1970	115614
1972	216625
1973	233817
1974	243463
1976	243231
1977	285154
1997	1172801
1999	1236996
2000	1329749
2001	1480647
2002	1669652
2003	1806355
2004	1721151
2005	2032563
2006	1961973
2007	1980521
2008	2290113
2009	2365251
2010	2675217
2011	2830263
2012	3014587
2013	3088755
2014	3140613
2015	3152893
2016	3252523
2017	3310842
2019	3421508