Year	Percent
1950	29.6695
1955	27.72734
1960	25.97731
1965	24.39614
1970	23.57838
1975	25.10639
1980	27.4364
1985	31.51876
1990	34.53394
1995	34.87954
2000	33.47219
2005	30.12312
2010	26.94195
2015	24.94096
2020	24.2877
2025	25.1419
2030	25.75504
2035	25.92652
2040	25.21954
2045	24.07801
2050	23.4129
2055	22.90177
2060	22.64672
2065	22.32602
2070	21.81946
2075	21.21049
2080	20.66881
2085	20.27893
2090	20.01919
2095	19.82359
2100	19.63319