Year	Number of
1990	2096.95
1991	2131.74
1992	2172.37
1993	2194.65
1994	2214.87
1995	2265.37
1996	2330.98
1997	2423.63
1998	2485.56
1999	2541.43
2000	2561.83
2001	2596.25
2002	2645.93
2003	2682.31
2004	2709.25
2005	2728.56
2006	2768.84
2007	2826.55
2008	2841.65
2009	2881.84
2010	2913.62
2011	2918.69
2012	2931.64
2013	2950.21
2014	2948.3
2015	2922.42
2016	2913.18