Year	Percent
1950	16.66154
1955	16.38405
1960	17.11244
1965	17.73036
1970	18.20572
1975	18.48035
1980	18.75253
1985	19.32362
1990	19.41257
1995	19.44778
2000	19.96454
2005	19.08033
2010	18.05136
2015	15.53037
2020	14.32256
2025	13.06697
2030	12.01233
2035	11.04371
2040	10.12328
2045	9.24942
2050	8.4587
2055	7.79797
2060	7.25282
2065	6.78769
2070	6.40008
2075	6.06629
2080	5.78779
2085	5.56986
2090	5.40535
2095	5.27111
2100	5.16149