Year	Percent
1960-01-01	23.7692
1961-01-01	20.9623
1962-01-01	21.5260
1963-01-01	15.2187
1964-01-01	18.7494
1965-01-01	21.2093
1966-01-01	21.9163
1967-01-01	20.9992
1968-01-01	22.8750
1969-01-01	21.6014
1970-01-01	16.6172
1971-01-01	19.2046
1972-01-01	21.5435
1973-01-01	21.7739
1974-01-01	21.1943
1975-01-01	21.2455
1976-01-01	21.7145
1977-01-01	24.5336
1978-01-01	24.3538
1979-01-01	21.9683
1980-01-01	21.2243
1981-01-01	21.1531
1982-01-01	20.9641
1983-01-01	20.5817
1984-01-01	22.1233
1985-01-01	24.8625
1986-01-01	26.5526
1987-01-01	27.1356
1988-01-01	28.8547
1989-01-01	30.5704
1990-01-01	31.4031
1991-01-01	31.9257
1992-01-01	34.3235
1993-01-01	37.2190
1994-01-01	40.4783
1995-01-01	42.7377
1996-01-01	43.5699
1997-01-01	45.7248
1998-01-01	50.7221
1999-01-01	54.2541
2000-01-01	53.2543
2001-01-01	54.1565
2002-01-01	55.6925
2003-01-01	61.0247
2004-01-01	67.1077
2005-01-01	70.0663
2006-01-01	69.3013
2007-01-01	68.6362
2008-01-01	76.8957
2009-01-01	82.8338
2010-01-01	82.4564
2011-01-01	86.6363
2012-01-01	93.5229
2013-01-01	101.4880
2014-01-01	102.7580
2015-01-01	100.4360
2016-01-01	97.6632