Year	Percent
1950	39.23546
1955	32.29565
1960	23.80854
1965	20.62378
1970	22.40974
1975	31.96704
1980	39.26327
1985	43.96502
1990	41.25946
1995	36.10988
2000	29.40772
2005	29.95346
2010	35.06089
2015	36.03811
2020	33.91024
2025	28.07201
2030	23.06397
2035	21.21823
2040	21.95561
2045	23.9693
2050	25.08803
2055	24.58677
2060	23.27489
2065	22.29568
2070	22.0905
2075	22.55614
2080	23.14873
2085	23.37068
2090	23.07978
2095	22.51072
2100	22.00524