Year	Percent
1960-01-01	23.2800
1961-01-01	23.2246
1962-01-01	19.8177
1963-01-01	17.4801
1964-01-01	13.2669
1965-01-01	13.5406
1966-01-01	14.6993
1967-01-01	16.0775
1968-01-01	14.1694
1969-01-01	16.4482
1970-01-01	18.7199
1971-01-01	22.5778
1972-01-01	26.6139
1973-01-01	26.9682
1974-01-01	22.4305
1975-01-01	29.3345
1976-01-01	25.5924
1977-01-01	28.0348
1978-01-01	37.2616
1979-01-01	31.1744
1980-01-01	31.1744
1981-01-01	31.1744
1982-01-01	31.1744
1983-01-01	31.1744
1984-01-01	31.1744
1985-01-01	31.1744
1986-01-01	31.1744
1987-01-01	31.1744
1988-01-01	31.1744
1989-01-01	31.1744
1990-01-01	31.1744
1991-01-01	31.1744
1992-01-01	31.1744
1993-01-01	31.1744
1994-01-01	31.1744
1995-01-01	31.1744
1996-01-01	31.1744
1997-01-01	31.1744
1998-01-01	31.1744
1999-01-01	31.1744
2000-01-01	53.8199
2001-01-01	47.3705
2002-01-01	35.7074
2003-01-01	31.8967
2004-01-01	28.2813
2005-01-01	25.4315
2006-01-01	24.1554
2007-01-01	26.0874
2008-01-01	36.0465
2009-01-01	65.4688
2010-01-01	51.8115
2011-01-01	129.5900
2012-01-01	57.5096
2013-01-01	99.1645
2014-01-01	99.1645
2015-01-01	305.6600
2016-01-01	293.2680