Year	Percent
1950	21.40704
1955	22.55344
1960	22.62424
1965	22.13304
1970	20.59195
1975	18.2251
1980	17.27564
1985	17.33613
1990	19.77199
1995	22.2347
2000	23.87029
2005	25.01326
2010	24.9702
2015	26.46976
2020	27.82034
2025	28.14155
2030	27.25372
2035	24.75592
2040	22.55285
2045	21.61436
2050	22.63071
2055	24.2412
2060	25.02608
2065	24.6273
2070	23.41995
2075	22.4785
2080	22.31734
2085	22.69005
2090	23.04136
2095	22.96705
2100	22.49237