Year	Number of
1990	1228.78
1991	1246.9
1992	1296.57
1993	1358.25
1994	1403.48
1995	1460.21
1996	1507.28
1997	1586.9
1998	1673.62
1999	1752.5
2000	1792.43
2001	1868.71
2002	1961.39
2003	2076.75
2004	2150.22
2005	2274.37
2006	2347.46
2007	2442
2008	2588.83
2009	2736.54
2010	2810.87
2011	2882.82
2012	3021.28
2013	3215.29
2014	3345.33
2015	3396.14
2016	3431.91