Year	Number
1981	2656200
1986	2824400
1989	2891800
1990	2937700
1991	2965800
1992	3006200
1993	2979800
1994	2992800
1995	3104400
1999	3052184
2000	3162849
2003	3773440
2004	3770452
2005	3727819
2006	3651503
2012	2736565
2013	2621677
2014	2567721
2015	2513653
2016	2513841
2017	2534824
2018	2582848