Year	Percent
1950	28.1414
1955	27.00607
1960	25.80634
1965	26.03802
1970	26.57998
1975	28.63739
1980	29.66363
1985	32.31257
1990	33.23879
1995	32.48153
2000	30.63101
2005	28.57798
2010	26.65467
2015	25.25254
2020	24.01995
2025	23.32172
2030	22.89937
2035	22.19679
2040	21.91467
2045	21.59497
2050	21.5281
2055	21.55531
2060	21.60549
2065	21.60787
2070	21.54237
2075	21.42387
2080	21.2909
2085	21.16796
2090	21.03968
2095	20.88592
2100	20.69624