Year	Number
1995	17173000
1996	17090000
1997	16647000
1998	17352000
1999	17467000
2000	17982000
2001	18180000
2002	18611000
2003	19078000
2004	19374000
2005	19952000
2006	20269000
2007	20773000
2008	21935000
2009	21355000
2010	22004000
2011	23012000
2012	24151000
2013	24813000
2014	25291000
2015	26728000
2016	28121000
2017	29460000
2018	30816000
2019	31884000
2020	15091000