Year	Percent
1960	0.13622
1961	1.60952
1962	3.93402
1963	7.03091
1964	53.42865
1965	48.95015
1966	46.91859
1967	57.50271
1968	55.58952
1969	64.37274
1970	42.2838
1971	41.17109
1972	60.41596
1973	45.28542
1974	83.85691
1975	104.76456
1976	71.66662
1977	76.58723
1978	76.64777
1979	121.45533
1980	197.1704
1981	166.66197
1982	179.25069
1983	118.50255
1984	167.76332
1985	78.05393
1986	94.22711
1987	118.66286
1988	153.97927
1989	130.12643
1990	135.94123
1991	99.55769
1992	101.44872
1993	126.9556
1994	168.1672
1995	106.53901
1996	230.68314
1997	96.85154
1998	113.22554
1999	91.66981
2000	74.77222
2001	79.7919
2002	62.59451
2003	70.39083
2004	126.98016
2005	67.4113
2006	89.29227
2007	99.09011
2008	102.61664
2009	88.33593
2010	72.31498
2011	80.4195
2012	83.84738
2013	159.54374
2014	146.63374
2015	131.67785
2016	123.61135
2017	96.50031
2018	111.01306
2019	117.12122
2020	137.56897
2021	102.23126