Year	Percent
1950	29.06846
1955	28.2935
1960	27.40762
1965	26.43995
1970	25.94317
1975	27.17561
1980	28.01001
1985	26.8751
1990	26.79651
1995	26.8328
2000	26.27654
2005	30.189
2010	32.05837
2015	34.19172
2020	36.52092
2025	32.45807
2030	32.3823
2035	31.03338
2040	30.60521
2045	30.65543
2050	29.80306
2055	28.74633
2060	27.80716
2065	27.1784
2070	26.68592
2075	26.0914
2080	25.35945
2085	24.63243
2090	24.04283
2095	23.58147
2100	23.18072