Year	Percent
1960-01-01	11.8307000000000000
1961-01-01	9.8435300000000000
1962-01-01	7.7622800000000005
1963-01-01	7.1274700000000000
1964-01-01	5.6164800000000000
1965-01-01	5.6265800000000010
1966-01-01	6.0478900000000000
1967-01-01	5.5730500000000000
1968-01-01	5.5567800000000010
1969-01-01	6.3840699999999995
1970-01-01	8.4941100000000010
1971-01-01	8.8542700000000000
1972-01-01	9.3922300000000000
1973-01-01	10.7865000000000000
1974-01-01	11.2642000000000000
1975-01-01	12.7828000000000000
1976-01-01	13.6238000000000000
1977-01-01	14.9182000000000000
1978-01-01	16.3384000000000000
1979-01-01	16.7460000000000000
1980-01-01	16.4380000000000000
1981-01-01	16.4696000000000000
1982-01-01	19.4287000000000000
1983-01-01	23.1727000000000000
1984-01-01	28.8276000000000000
1985-01-01	31.5868000000000000
1986-01-01	30.9278000000000000
1987-01-01	28.5929000000000000
1988-01-01	20.1804000000000000
1989-01-01	21.6282000000000000
1990-01-01	22.0152000000000000
1991-01-01	21.9620000000000000
1992-01-01	22.2243000000000000
1993-01-01	26.9365000000000000
1994-01-01	25.5865000000000000
1995-01-01	27.4287000000000000
1996-01-01	26.1896000000000000
1997-01-01	26.7622000000000000
1998-01-01	27.9798000000000000
1999-01-01	31.1981000000000000
2000-01-01	32.8568000000000000
2001-01-01	39.3621000000000000
2002-01-01	43.1323000000000000
2003-01-01	52.4089000000000000
2004-01-01	46.1234000000000000
2005-01-01	42.0364000000000000
2006-01-01	41.9520000000000000
2007-01-01	40.1039000000000000
2008-01-01	43.4576000000000000
2009-01-01	48.1432000000000000
2010-01-01	48.8395000000000000