Year	Percent
1950	27.20005
1955	26.64511
1960	28.12266
1965	25.70841
1970	26.65676
1975	27.76587
1980	29.30041
1985	30.97715
1990	30.27021
1995	29.43824
2000	28.07558
2005	26.85465
2010	25.62807
2015	24.21913
2020	23.85178
2025	23.56959
2030	23.54185
2035	23.59982
2040	23.40888
2045	23.06007
2050	22.72545
2055	22.62054
2060	22.66299
2065	22.69014
2070	22.5876
2075	22.33939
2080	22.04583
2085	21.82125
2090	21.68215
2095	21.58201
2100	21.45966