Year	Percent
1989-01-01	22.4792
1990-01-01	23.0213
1991-01-01	22.8893
1992-01-01	22.7387
1993-01-01	22.4445
1994-01-01	24.7179
1995-01-01	25.8768
1996-01-01	25.6973
1997-01-01	28.2304
1998-01-01	29.5901
1999-01-01	30.6903
2000-01-01	33.0900
2001-01-01	34.9551
2002-01-01	34.5715
2003-01-01	35.4119
2004-01-01	37.6769
2005-01-01	39.5760
2006-01-01	41.3406
2007-01-01	42.6155
2008-01-01	44.9822
2009-01-01	42.6255
2010-01-01	40.9003
2011-01-01	40.2258
2012-01-01	41.4671
2013-01-01	44.1833
2014-01-01	45.8547
2015-01-01	48.8584
2016-01-01	53.0218