Year	Number
1991	15616294
1992	15839409
1993	16072158
1994	16414513
1995	16540582
1996	16812772
1997	17144954
1998	17408242
1999	17726769
2000	18242081
2001	18127540
2002	18960316
2003	19731180
2004	20419303
2005	21197697
2006	21880145
2007	22508326
2008	23150283
2009	23364217
2010	23482007
2011	23558862
2012	23569775
2013	23332032
2014	23091303
2015	23036096
2016	22977372
2017	22897891
2018	22930164
2019	23139046
2020	22838137
2021	23384158
2022	23687273
2023	24107955