Year	Number
1987	25.96154
1988	26.73077
1989	26.51852
1990	25.43333
1991	25.65372
1992	25.25234
2000	23.20826
2001	23.81876
2002	28.75162
2003	24.48955
2004	19.27998
2005	21.13767
2006	22.46631
2007	22.06239
2008	21.46367
2009	18.84797
2010	18.28517
2011	18.18672
2012	18.82678
2014	19.36105
2017	61.81179