Year	Number
1991	13867845
1992	14275486
1993	14697546
1994	15067090
1995	15201443
1996	15563537
1997	15992986
1998	16307035
1999	16410324
2000	16588444
2001	16651214
2002	16491672
2003	16951795
2004	17425150
2005	17545905
2006	17877291
2007	17924078
2008	17966575
2009	18324357
2010	18255867
2011	18663922
2012	18835226
2013	18964106
2014	19049721
2015	19229476
2016	19404277
2017	19580710
2018	20103008
2019	20607477
2020	19406591
2021	21191985
2022	21511126
2023	21906419