Year	Percent
1975-01-01	6.70034
1976-01-01	7.32615
1977-01-01	6.03103
1978-01-01	5.96744
1979-01-01	7.76817
1980-01-01	6.42650
1981-01-01	7.62605
1982-01-01	13.41550
1983-01-01	14.24140
1984-01-01	13.11430
1985-01-01	13.38180
1986-01-01	14.75490
1987-01-01	18.53710
1988-01-01	16.31570
1989-01-01	13.07500
1990-01-01	9.42429
1991-01-01	9.97317
1992-01-01	11.09520
1993-01-01	15.31180
1994-01-01	15.69410
1995-01-01	15.38940
1996-01-01	20.26090
1997-01-01	23.72260
1998-01-01	31.05650
1999-01-01	24.12560
2000-01-01	22.49680
2001-01-01	21.88390
2002-01-01	25.13680
2003-01-01	25.21860
2004-01-01	32.23630
2005-01-01	37.61460
2006-01-01	39.28940
2007-01-01	56.70000
2008-01-01	64.53600
2009-01-01	59.00620
2010-01-01	41.46830
2011-01-01	40.05830
2012-01-01	39.30140
2013-01-01	33.69780
2014-01-01	28.45340