Year	Number of
1990	1302.96
1991	1384.03
1992	1471.43
1993	1562.62
1994	1662.73
1995	1775.24
1996	1802.37
1997	1833.2
1998	1861.49
1999	1887.72
2000	1913.1
2001	1963.17
2002	2015.83
2003	2064.67
2004	2117.29
2005	2175.18
2006	2197.26
2007	2219.28
2008	2246.02
2009	2276.16
2010	2310.58
2011	2346.43
2012	2386.06
2013	2427.21
2014	2471.85
2015	2519.76
2016	2579.31