Year	Number
1991	3168564
1992	3267770
1993	3366798
1994	3465767
1995	3567466
1996	3667107
1997	3773272
1998	3886371
1999	4000815
2000	4118457
2001	4234659
2002	4358998
2003	4484181
2004	4617954
2005	4720723
2006	4825217
2007	4931026
2008	5037761
2009	5145327
2010	5253574
2011	5486770
2012	5980602
2013	5682211
2014	5883588
2015	6022488
2016	6184488
2017	6364813
2018	6472399
2019	6481136
2020	6460734
2021	6764382
2022	7069008
2023	7257874