Year	Number of
1990	1132.09
1991	1152.97
1992	1184.51
1993	1228.01
1994	1293.29
1995	1346.66
1996	1360.43
1997	1381.36
1998	1402.01
1999	1415.75
2000	1421.18
2001	1380.9
2002	1343.25
2003	1317.28
2004	1310.19
2005	1314.88
2006	1305.74
2007	1298.53
2008	1282.15
2009	1293.78
2010	1321.76
2011	1336.32
2012	1346.7
2013	1354.21
2014	1363.11
2015	1374.2
2016	1390.65