Year	Percent
1950	27.0321
1955	28.81782
1960	31.9057
1965	31.44208
1970	29.29662
1975	28.38672
1980	28.90285
1985	29.9042
1990	30.34074
1995	30.43505
2000	29.01105
2005	27.69145
2010	27.18072
2015	25.95458
2020	25.60682
2025	24.38635
2030	22.7733
2035	21.33924
2040	21.36487
2045	22.58127
2050	23.28889
2055	22.9163
2060	22.25907
2065	21.68847
2070	21.68935
2075	22.23256
2080	22.7444
2085	22.74481
2090	22.29527
2095	21.78585
2100	21.56405