Year	Number
1992	71.547803047
1993	72.1483771252
1994	64.6191212188
1995	61.6913225878
1996	59.4259218371
1997	55.2793111062
1998	45.1976153676
1999	52.8505188783
2000	48.5316846986
2001	43.8198277766
2002	43.8021638331
2003	46.4473393685
2004	49.3486420843
2005	52.1086332524
2006	53.6277323913
2007	53.367189225
2008	50.9163170678
2009	49.1940825789
2010	48.4433649812
2011	49.8829763745
2012	52.8814307794
2013	52.9653345109
2014	51.1901081917
2015	51.6184588209
2016	52.4530801501
2017	53.5217487304
2018	53.7293000662
2019	55.5972620888
2020	55.5972620888