Year	Number
1971	41.45214
1972	41.62027
1973	42.53532
1974	42.52025
1975	41.93173
1976	42.11305
1979	42.89832
1999	40
2000	39.99999
2001	40.14999
2002	40.66296
2003	41.32988
2011	35.15463
2013	32.31833
2014	31.28855
2015	31.49146
2016	35.21588
2017	32.74955