Year	Percent
1950	29.36283
1955	29.11317
1960	28.39941
1965	27.60421
1970	26.93137
1975	26.30963
1980	26.46414
1985	26.84809
1990	27.14231
1995	27.72029
2000	28.53459
2005	29.09647
2010	29.44268
2015	29.67866
2020	29.73873
2025	29.78629
2030	29.95651
2035	30.35254
2040	30.66101
2045	30.82895
2050	30.79916
2055	30.57597
2060	30.36524
2065	30.18153
2070	29.9969
2075	29.77201
2080	29.48913
2085	29.16978
2090	28.8489
2095	28.53578
2100	28.23072