Year	Number of
1990	1168.62
1991	1238.26
1992	1324.54
1993	1407.72
1994	1505.5
1995	1612.03
1996	1713.77
1997	1817.32
1998	1927.5
1999	2012.73
2000	2100.4
2001	2183.93
2002	2258.93
2003	2347.59
2004	2472.63
2005	2591.29
2006	2666.94
2007	2762.63
2008	2841.51
2009	2917.42
2010	3025.71
2011	3147.23
2012	3240.9
2013	3327.07
2014	3438.7
2015	3547.22
2016	3644.79