Year	Number of
1990	31824.64
1991	31125.14
1992	32784.73
1993	36655.86
1994	37807.23
1995	34858.82
1996	31340.96
1997	28290.29
1998	26989.23
1999	28066.28
2000	28588.11
2001	27860.73
2002	27672.01
2003	27228.2
2004	26397.67
2005	26244.34
2006	24504.02
2007	23906.21
2008	23792.36
2009	22550.91
2010	22431.26
2011	21726.39
2012	20862.05
2013	20711.02
2014	20866.36
2015	21504.99
2016	22003.6