Year	Percent
1950	29.62541
1955	27.45293
1960	26.398
1965	25.53338
1970	27.45354
1975	29.76809
1980	30.54139
1985	31.06577
1990	28.92677
1995	26.57431
2000	25.19599
2005	24.16609
2010	23.54203
2015	24.23402
2020	23.74982
2025	22.93536
2030	22.64976
2035	22.06504
2040	22.26243
2045	22.59899
2050	22.52492
2055	22.38143
2060	22.11517
2065	21.87833
2070	21.7478
2075	21.6903
2080	21.60747
2085	21.43284
2090	21.20843
2095	20.98868
2100	20.79527