Year	Number
1993	29.74639
1994	32.89804
1995	31.8788
1996	35.47525
1997	35.09225
1998	34.37247
1999	34.67901
2000	34.70343
2001	34.59441
2002	34.67576
2003	34.65878
2004	35.15769
2005	33.21247
2006	31.99448
2007	30.83289
2008	29.95208
2009	28.89773
2010	29.85328
2011	31.20174
2012	31.28194
2013	29.00706
2014	29.25521
2015	29.25041
2016	26.80018
2017	25.30846
2018	25.83159