Year	Percent
1950	19.35004
1955	18.92876
1960	19.25775
1965	19.34385
1970	19.37421
1975	19.34008
1980	19.26017
1985	18.90758
1990	18.57495
1995	18.20236
2000	17.80503
2005	18.19543
2010	18.24433
2015	17.88682
2020	16.95099
2025	16.21057
2030	15.60179
2035	14.99584
2040	14.34301
2045	13.66508
2050	12.98347
2055	12.36175
2060	11.7981
2065	11.2432
2070	10.72477
2075	10.21671
2080	9.73979
2085	9.30047
2090	8.90139
2095	8.5178
2100	8.14472