Period	Percent
1970-01-01	0.95
1975-01-01	1.20
1980-01-01	1.80
1985-01-01	2.80
1990-01-01	3.70
1995-01-01	5.03
2000-01-01	5.94
2005-01-01	8.45
2010-01-01	12.50