Year	Percent
1960	222.85722
1961	295.71439
1962	201.70076
1963	138.91631
1964	112.30163
1965	150.63498
1966	218.46699
1967	200.87471
1968	174.3387
1969	169.74032
1970	139.00005
1971	237.02291
1972	151.98792
1973	80.55708
1974	107.77551
1975	105.30594
1976	56.36362
1977	79.71737
1978	74.07794
1979	68.10913
1980	58.27773
1981	63.24623
2007	31.22133
2008	29.26953
2009	22.99872
2010	36.60447
2011	39.29711
2012	31.21406
2013	41.46995
2014	12.87598
2015	12.04245
2016	18.41901
2017	28.43666
2018	28.04583
2019	21.88965
2020	31.62941
2021	25.80611