Year	Percent
1950	27.68026
1955	27.758
1960	28.60632
1965	28.1915
1970	26.59664
1975	25.72893
1980	25.99423
1985	28.74449
1990	29.95492
1995	31.80299
2000	35.2353
2005	38.86811
2010	39.42899
2015	35.84386
2020	32.92882
2025	30.98093
2030	30.04253
2035	30.21406
2040	30.14136
2045	29.48712
2050	28.16166
2055	26.47387
2060	25.43532
2065	25.02799
2070	24.99233
2075	24.92334
2080	24.54335
2085	23.90924
2090	23.29074
2095	22.92016
2100	22.81431