Year	Percent
1950	27.20862
1955	29.54515
1960	32.69924
1965	31.52521
1970	30.55032
1975	30.48561
1980	30.93272
1985	34.31151
1990	33.82508
1995	31.68765
2000	30.08467
2005	29.0712
2010	29.0671
2015	27.5337
2020	27.37754
2025	25.64641
2030	23.81472
2035	22.04156
2040	20.40515
2045	20.56446
2050	20.69674
2055	20.75712
2060	20.47893
2065	19.97508
2070	19.64161
2075	19.75768
2080	20.17383
2085	20.53749
2090	20.62922
2095	20.46035
2100	20.23338