Year	Percent
1950	4.23412
1955	4.17017
1960	4.21696
1965	4.27699
1970	4.33222
1975	4.38654
1980	4.43847
1985	4.50507
1990	4.84007
1995	4.98495
2000	5.07108
2005	5.59343
2010	5.87573
2015	5.65809
2020	5.92682
2025	6.39873
2030	7.11566
2035	7.9435
2040	8.89993
2045	9.9188
2050	10.79618
2055	11.61132
2060	12.46948
2065	13.32206
2070	14.39566
2075	15.73329
2080	17.01529
2085	18.20931
2090	19.35146
2095	20.51419
2100	21.70595