Year	Percent
1960	104.58334
1961	89.75
1962	110.6
1963	67.2
1964	67.03703
1965	55.9589
1966	98.96724
1967	115.18011
1968	114.04255
1969	141.2
1970	140.25806
1971	123.4308
1972	127.71611
1973	141.64574
1974	144.11667
1975	115.02201
1976	89.3648
1977	84.43
1978	82.60013
1979	110.30026
1980	76.09469
1981	81.92321
1982	60.05609
1983	74.28188
1984	64.8744
1985	59.47864
1986	66.4131
1987	70.71092
1988	70.54565
1989	69.87641
1990	77.06602
1991	133.99502
1992	109.99621
1993	107.18964
1994	946.07576
1995	400.51461
1996	234.23914
1997	89.84493
1998	118.85927
1999	144.45523
2000	126.40432
2001	121.16378
2002	144.96224
2003	119.29897
2004	143.93073
2005	128.86191
2006	121.38124
2007	114.14657
2008	84.62126
2009	78.35138
2010	82.15821
2011	87.79008
2012	49.25946
2013	56.86442
2014	54.08695
2015	52.59206
2016	51.06071
2017	55.8321
2018	52.16946
2019	41.90251
2020	67.81064
2021	44.86782