Year	Number
1993	16.22754
1994	16.6123
1995	15.74122
1996	15.82933
1997	14.58521
1999	19.66684
2000	17.1169
2001	15.97848
2002	15.72922
2003	15.80193
2004	15.90994
2012	19.87954
2013	21.28925