Year	Percent
1950	22.98116
1955	22.80341
1960	22.48383
1965	22.74778
1970	22.32855
1975	21.21451
1980	20.72224
1985	20.64779
1990	22.10941
1995	24.06016
2000	26.17305
2005	27.6224
2010	26.56066
2015	26.20354
2020	25.17911
2025	24.93592
2030	25.1726
2035	25.0739
2040	24.88214
2045	24.05439
2050	23.5579
2055	23.41335
2060	23.8193
2065	24.16564
2070	24.01905
2075	23.66492
2080	23.21066
2085	22.95233
2090	22.87096
2095	22.8471
2100	22.73697