Year	Percent
1950	15.55836
1955	15.36965
1960	15.09967
1965	14.73271
1970	14.28119
1975	13.78497
1980	13.15036
1985	12.88115
1990	12.75326
1995	12.85286
2000	12.62526
2005	12.40323
2010	12.03971
2015	11.72203
2020	11.55687
2025	11.5947
2030	11.92207
2035	12.51073
2040	13.46008
2045	14.36412
2050	15.28133
2055	16.17358
2060	17.0981
2065	18.10686
2070	19.072
2075	19.98792
2080	20.76715
2085	21.48138
2090	22.15805
2095	22.79007
2100	23.36328