Year	Number of
1990	1006.48
1991	976.65
1992	973.52
1993	984.28
1994	1002.35
1995	1022.51
1996	1025.34
1997	1042.77
1998	1063.44
1999	1071.15
2000	1075.88
2001	1083.24
2002	1102.46
2003	1117.21
2004	1129.5
2005	1140.58
2006	1129.35
2007	1127.8
2008	1136.7
2009	1172.12
2010	1207.29
2011	1232.65
2012	1266.52
2013	1275.63
2014	1283.42
2015	1316.32
2016	1354