Year	Number
1993	46.1040221914
1994	45.294036061
1995	44.4840499307
1996	40.9697642164
1997	37.4554785021
1998	33.9411927878
1999	30.4269070735
2000	29.1262135922
2001	28.8904299584
2002	30.8737864078
2003	31.8446601942
2004	32.7877947295
2005	34.3966712899
2006	29.4590846047
2007	31.6366158114
2008	28.3911234397
2009	29.8751733703
2010	33.0235783634
2011	30.4438280166
2012	29.6671289875
2013	31.2482662968
2014	32.0110957004
2015	30.0416088766
2016	30
2017	31.1373092926
2018	32.6518723994
2019	32.6158113731
2020	34.0984743412