Year	Percent
1950	26.94586
1955	25.18363
1960	22.43548
1965	21.94818
1970	23.77595
1975	26.47989
1980	28.11098
1985	29.32858
1990	28.42337
1995	29.33172
2000	31.16866
2005	32.84841
2010	32.28092
2015	27.60205
2020	24.46651
2025	23.1573
2030	24.08415
2035	25.54757
2040	25.96487
2045	25.10726
2050	23.5431
2055	22.45393
2060	22.33528
2065	22.85193
2070	23.33542
2075	23.2787
2080	22.68649
2085	21.96126
2090	21.50157
2095	21.43009
2100	21.55729