Year	Percent
1950	29.858
1955	26.73061
1960	23.5153
1965	21.2755
1970	22.17393
1975	26.38741
1980	29.81673
1985	34.55948
1990	36.27359
1995	35.3617
2000	31.48933
2005	29.52421
2010	27.74592
2015	26.09907
2020	25.06711
2025	24.23343
2030	23.86504
2035	23.57758
2040	23.4909
2045	23.28761
2050	23.13974
2055	22.98441
2060	22.86143
2065	22.75369
2070	22.64803
2075	22.52732
2080	22.37161
2085	22.20431
2090	22.04958
2095	21.92208
2100	21.81902