Year	Percent
1950	12.66064
1955	12.70808
1960	13.05836
1965	13.19082
1970	13.7604
1975	14.25402
1980	14.61881
1985	14.94281
1990	15.44778
1995	15.43514
2000	14.9235
2005	14.34729
2010	14.40057
2015	14.45065
2020	14.10607
2025	13.46792
2030	12.8631
2035	12.32993
2040	11.88841
2045	11.42974
2050	10.99708
2055	10.55588
2060	10.11469
2065	9.69182
2070	9.31815
2075	8.98141
2080	8.6424
2085	8.31179
2090	7.99031
2095	7.68523
2100	7.40192