Year	Percent
1950	12.80092
1955	12.82077
1960	12.91773
1965	13.04403
1970	13.05473
1975	12.96992
1980	12.10538
1985	11.60964
1990	11.14083
1995	10.69388
2000	10.32707
2005	9.87316
2010	9.81354
2015	10.17271
2020	10.82185
2025	11.55815
2030	12.29841
2035	13.12226
2040	14.04211
2045	15.15534
2050	16.35582
2055	17.51152
2060	18.63095
2065	19.64428
2070	20.57678
2075	21.41956
2080	22.12928
2085	22.71389
2090	23.18114
2095	23.56353
2100	23.88459