Year	Percent
1950	31.78012
1955	29.60024
1960	33.47637
1965	31.32937
1970	28.47085
1975	29.74812
1980	28.25536
1985	29.46077
1990	29.14353
1995	28.33471
2000	28.29887
2005	29.31905
2010	30.55347
2015	29.83156
2020	27.32169
2025	23.90779
2030	21.69074
2035	21.61128
2040	22.73654
2045	23.80882
2050	23.25651
2055	22.28524
2060	21.70377
2065	21.84243
2070	22.51449
2075	23.15976
2080	23.25918
2085	22.79803
2090	22.21939
2095	21.946
2100	22.0328