Year	Percent
1976-01-01	0.7980800000000000
1977-01-01	3.4514199999999997
1978-01-01	4.6682300000000000
1979-01-01	3.6726300000000003
1980-01-01	3.5983600000000000
1981-01-01	6.1075000000000000
1982-01-01	11.9386000000000000
1983-01-01	16.8443000000000000
1984-01-01	19.7035000000000000
1985-01-01	19.5132000000000000
1986-01-01	16.2235000000000000
1987-01-01	13.1839000000000000
1988-01-01	10.8517000000000000
1989-01-01	9.7535600000000000
1990-01-01	10.2202000000000000
1991-01-01	9.3488700000000000
1992-01-01	7.8030300000000010
1993-01-01	8.6372500000000000
1994-01-01	10.2270000000000000
1995-01-01	10.5992000000000000
1996-01-01	11.0592000000000000
1997-01-01	11.1614000000000000
1998-01-01	13.7853000000000000
1999-01-01	14.3547000000000000
2000-01-01	14.3636000000000000
2001-01-01	16.4649000000000000
2002-01-01	18.5561000000000000
2003-01-01	16.1803000000000000
2004-01-01	22.9083000000000000
2005-01-01	31.1085000000000000
2006-01-01	34.6102000000000000
2007-01-01	43.9963000000000000
2008-01-01	52.1345000000000000
2009-01-01	55.1786000000000000
2010-01-01	48.4364000000000000
2011-01-01	40.7015000000000000
2012-01-01	37.0540000000000000
2013-01-01	30.9409000000000000
2014-01-01	28.3766000000000000
2015-01-01	28.3023000000000000
2016-01-01	29.6325000000000000