Year	Percent
1950	16.80238
1955	17.75316
1960	17.89671
1965	18.01138
1970	17.41044
1975	16.39825
1980	15.85719
1985	14.50891
1990	13.78658
1995	12.77622
2000	11.61258
2005	10.72421
2010	10.04474
2015	9.62509
2020	8.90789
2025	8.20921
2030	7.59175
2035	7.08874
2040	6.6904
2045	6.35784
2050	6.04091
2055	5.73807
2060	5.47767
2065	5.27083
2070	5.11127
2075	4.98468
2080	4.87807
2085	4.7813
2090	4.69527
2095	4.62972
2100	4.58102