Year	Percent
1972	202.14779
1973	200.30507
1974	109.15165
1975	214.03514
1976	146.70137
1977	248.84885
1978	108.8868
1979	145.41528
1980	206.04788
1981	105.09345
1982	80.41123
1983	94.02345
1984	82.79871
1985	96.49922
1986	87.72113
1987	99.85834
1988	84.04024
1989	93.86071
1990	72.85776
1991	87.81902
1992	133.49387
2006	168.11036
2007	154.08395
2008	154.92824
2009	116.45529
2010	106.21987
2011	195.21318
2012	125.4818
2013	110.4673
2014	149.95714
2015	91.13825
2016	100.28418
2017	137.1517
2018	176.34023
2019	171.32967
2020	179.94573
2021	152.39027