Year	Percent
1980-01-01	3.2275200000000000
1981-01-01	3.4680000000000000
1982-01-01	3.6011900000000003
1983-01-01	3.4631800000000004
1984-01-01	4.1192000000000000
1985-01-01	4.8555900000000000
1986-01-01	6.0766900000000000
1987-01-01	9.1567100000000000
1988-01-01	9.5692899999999990
1989-01-01	10.6319000000000000
1990-01-01	13.6224000000000000
1991-01-01	16.2140000000000020
1992-01-01	17.6495000000000000
1993-01-01	17.3659000000000000
1994-01-01	15.1280000000000000
1995-01-01	10.2425000000000000
1996-01-01	10.3980000000000000
1997-01-01	12.8111000000000000
1998-01-01	10.9116000000000000
1999-01-01	11.2854000000000000
2000-01-01	12.5772000000000000
2001-01-01	12.7672000000000000
2002-01-01	14.4771000000000000
2003-01-01	16.2408000000000000
2004-01-01	18.6827000000000000
2005-01-01	18.0808000000000000
2006-01-01	22.6171000000000000
2007-01-01	21.0588000000000000
2008-01-01	19.8807000000000000
2009-01-01	30.6917000000000000
2010-01-01	31.9569999999999970
2011-01-01	29.8242000000000000
2012-01-01	38.2810000000000000
2013-01-01	42.8483000000000000
2014-01-01	40.6370000000000000
2015-01-01	49.8151000000000000
2016-01-01	51.0706000000000000