Year	Percent
1950	28.41385
1955	28.76549
1960	25.89011
1965	23.92364
1970	22.41696
1975	22.18261
1980	25.7724
1985	26.6014
1990	26.27232
1995	26.61381
2000	26.76835
2005	28.81409
2010	31.10143
2015	30.49335
2020	28.74775
2025	26.80199
2030	25.57039
2035	25.74531
2040	25.93099
2045	25.17654
2050	23.81147
2055	23.07386
2060	22.90764
2065	23.2609
2070	23.64891
2075	23.68236
2080	23.36637
2085	22.90595
2090	22.59242
2095	22.52467
2100	22.58698