Year	Percent
1950	13.63227
1955	13.48671
1960	13.25112
1965	13.02529
1970	12.6975
1975	13.0012
1980	13.5196
1985	14.09488
1990	14.72457
1995	15.5195
2000	16.11766
2005	16.97007
2010	18.04663
2015	19.0103
2020	19.93329
2025	20.61477
2030	21.75605
2035	23.8521
2040	25.99549
2045	27.09186
2050	27.31136
2055	26.43306
2060	25.46837
2065	25.32585
2070	25.21314
2075	24.85261
2080	24.09309
2085	23.32671
2090	22.80573
2095	22.54547
2100	22.41548