Year	Percent
1960-01-01	8.24244
1961-01-01	8.95618
1962-01-01	8.85135
1963-01-01	9.37464
1964-01-01	10.85760
1965-01-01	12.05520
1966-01-01	12.90240
1967-01-01	14.72720
1968-01-01	15.62430
1969-01-01	15.53940
1970-01-01	17.06480
1971-01-01	17.61960
1972-01-01	18.09040
1973-01-01	19.11180
1974-01-01	18.66170
1975-01-01	18.86890
1976-01-01	20.67640
1977-01-01	22.05590
1978-01-01	23.05480
1979-01-01	22.37940
1980-01-01	22.42680
1981-01-01	22.40660
1982-01-01	22.91710
1983-01-01	23.71460
1984-01-01	21.14760
1985-01-01	19.05960
1986-01-01	19.08360
1987-01-01	17.52600
1988-01-01	17.11550
1989-01-01	18.10950
1990-01-01	20.20280
1991-01-01	19.82830
1992-01-01	24.37900
1993-01-01	27.16780
1994-01-01	29.19150
1995-01-01	27.28350
1996-01-01	25.40470
1997-01-01	25.27580
1998-01-01	23.99580
1999-01-01	24.14080
2000-01-01	24.25910
2001-01-01	23.10940
2002-01-01	21.02230
2003-01-01	19.98890
2004-01-01	20.27880
2005-01-01	20.39960
2006-01-01	19.76840
2007-01-01	20.17120
2008-01-01	21.47600
2009-01-01	31.69960
2010-01-01	37.20920
2011-01-01	40.27750
2012-01-01	43.98930
2013-01-01	44.06790
2014-01-01	47.59430
2015-01-01	52.42080
2016-01-01	52.97850