Year	Number
1981	172064
1986	172349
1989	191655
1990	193436
1991	202222
1992	202970
1993	210834
1994	215175
1995	221569
1996	223662
1997	225701
1998	222278
1999	219661
2000	218181
2001	211650
2002	197463
2003	183542
2004	170216
2005	158105
2006	150422
2007	143814
2008	135719
2009	129496
2010	122458
2011	115581
2012	111389
2013	109028
2014	108115
2015	108038
2016	110193
2017	113881
2018	116626
2019	117676
2020	118616
2021	116682