Year	Number
1973	2265469
1976	2183413
1977	2238186
1979	2349920
1980	2659208
1981	2407888
1983	2959437
1984	3111267
1985	3125219
1986	3136454
1987	3272858
1988	3340120
1989	3406520
1990	3592995
1998	9133579
1999	9912318
2000	10329065
2001	10690742
2002	11024326
2003	11051234
2004	10354760
2005	10109395
2006	10250862
2007	10444714
2008	10036889
2009	10907065
2010	11334055
2011	11542964
2012	12187154
2013	13314078
2015	14566771
2016	15787818
2017	15314757
2018	15869820
2019	15710974
2020	15954852
2021	16022928
2022	16070344