Year	Percent
1950	28.56425
1955	27.45115
1960	26.49767
1965	25.73014
1970	25.54806
1975	27.18568
1980	29.90999
1985	30.05735
1990	29.58447
1995	28.58217
2000	26.89633
2005	30.13482
2010	31.8528
2015	33.34558
2020	35.35199
2025	31.32449
2030	30.90873
2035	29.89214
2040	29.4899
2045	29.28011
2050	28.44551
2055	27.31381
2060	26.30694
2065	25.65342
2070	25.13314
2075	24.54972
2080	23.87479
2085	23.22332
2090	22.70631
2095	22.31353
2100	21.97085