Year	Percent
1950	8.69671
1955	8.95811
1960	9.76844
1965	10.77787
1970	12.45009
1975	12.2997
1980	12.41921
1985	12.51962
1990	14.84396
1995	15.91591
2000	16.79894
2005	18.75429
2010	22.90284
2015	25.05846
2020	27.60318
2025	29.31309
2030	29.96206
2035	31.11989
2040	32.86497
2045	34.79102
2050	36.77999
2055	38.47157
2060	39.18372
2065	39.03206
2070	38.7628
2075	38.68529
2080	38.67892
2085	38.78376
2090	38.87689
2095	38.88034
2100	38.89761