5-years	Percent
1970-01-01	5.67
1975-01-01	6.09
1980-01-01	7.74
1985-01-01	9.38
1990-01-01	11.17
1995-01-01	12.19
2000-01-01	13.64
2005-01-01	14.93
2010-01-01	13.72