Year	Percent
1950	30.03323
1955	28.22041
1960	29.21432
1965	27.84609
1970	27.35436
1975	28.32232
1980	28.49689
1985	27.39015
1990	26.78578
1995	25.81272
2000	26.69992
2005	27.61244
2010	26.96538
2015	25.90105
2020	23.43895
2025	22.39459
2030	21.79743
2035	20.59911
2040	20.46474
2045	20.50122
2050	20.33679
2055	20.33554
2060	20.29493
2065	20.31258
2070	20.38206
2075	20.53852
2080	20.69561
2085	20.76468
2090	20.763
2095	20.70106
2100	20.60226