Year	Percent
1950	13.82467
1955	14.01127
1960	14.34769
1965	14.66425
1970	14.7106
1975	14.31912
1980	13.80921
1985	12.83581
1990	11.8913
1995	11.23326
2000	10.54308
2005	10.22881
2010	9.64918
2015	9.26054
2020	8.9694
2025	8.40421
2030	7.94098
2035	7.55351
2040	7.19146
2045	6.85008
2050	6.54898
2055	6.26873
2060	6.01569
2065	5.79986
2070	5.6229
2075	5.46042
2080	5.31962
2085	5.19567
2090	5.08515
2095	4.99084
2100	4.91107