Year	Percent
1950	30.53656
1955	30.54273
1960	30.56092
1965	29.48091
1970	28.33455
1975	26.60556
1980	26.81857
1985	27.48112
1990	27.63627
1995	28.33527
2000	28.87601
2005	28.07002
2010	28.14411
2015	28.18698
2020	27.89519
2025	27.85732
2030	27.30641
2035	26.31223
2040	25.48862
2045	24.89661
2050	24.37628
2055	23.85691
2060	23.30487
2065	22.76302
2070	22.29264
2075	21.93119
2080	21.66116
2085	21.43512
2090	21.22752
2095	21.02747
2100	20.8499