Year	Number of
1990	12123.54
1991	12500.78
1992	12668.71
1993	13045.04
1994	13369.36
1995	13684.25
1996	13756.85
1997	14023.92
1998	14029.29
1999	14759.75
2000	14531.24
2001	14542.57
2002	14292.07
2003	15149.29
2004	15154.45
2005	15430.88
2006	15460.24
2007	14974.38
2008	14610.81
2009	16071.06
2010	16530.94
2011	16872.44
2012	16933
2013	17523.45
2014	17534.23
2015	17644.56
2016	17921.94