Year	Percent
1950	4.58455
1955	4.66905
1960	4.87735
1965	4.92274
1970	5.09732
1975	5.30737
1980	5.36828
1985	5.54802
1990	6.42125
1995	6.86116
2000	7.72829
2005	8.67985
2010	10.03255
2015	11.85851
2020	13.95704
2025	16.41102
2030	18.82918
2035	21.21542
2040	23.95643
2045	26.96705
2050	29.59795
2055	31.89077
2060	34.08094
2065	35.73274
2070	36.80796
2075	37.72481
2080	38.40502
2085	38.8499
2090	39.12426
2095	39.29977
2100	39.41955