Year	Percent
1950	29.40069
1955	29.52105
1960	32.47554
1965	30.78901
1970	27.7066
1975	27.29279
1980	26.66559
1985	28.99256
1990	29.8482
1995	29.07506
2000	28.12158
2005	27.69178
2010	27.65981
2015	26.87679
2020	25.14059
2025	23.01464
2030	21.76067
2035	21.6619
2040	22.50163
2045	23.42611
2050	23.00309
2055	21.74874
2060	21.24268
2065	21.48064
2070	21.97737
2075	22.17747
2080	21.87114
2085	21.2854
2090	20.84133
2095	20.74297
2100	20.86278