Year	Percent
1950	27.7853
1955	27.74981
1960	24.27511
1965	22.13215
1970	21.11396
1975	21.03735
1980	23.61274
1985	25.40062
1990	26.15987
1995	25.3011
2000	27.16053
2005	28.67767
2010	30.69756
2015	30.79742
2020	29.58917
2025	28.0719
2030	26.74321
2035	26.79424
2040	26.54144
2045	25.33203
2050	24.06059
2055	22.98303
2060	23.02454
2065	23.47669
2070	23.83947
2075	23.81318
2080	23.40209
2085	22.93459
2090	22.68246
2095	22.70497
2100	22.81702