Year	Number of
1990	22004.56
1991	23320.64
1992	24543.47
1993	24892.56
1994	25158.53
1995	25788.73
1996	23949.94
1997	21840.84
1998	19759.22
1999	19396.39
2000	19124.97
2001	18262.07
2002	17659
2003	17324.95
2004	17418.25
2005	17537.7
2006	16657.95
2007	17018.09
2008	16929.65
2009	15016.48
2010	14296.06
2011	14011.2
2012	14414.08
2013	14447.08
2014	14015.11
2015	14144.14
2016	14337.22