Year	Percent
1950	22.01825
1955	23.00001
1960	20.81785
1965	21.33185
1970	21.25678
1975	20.78371
1980	21.15944
1985	20.12282
1990	20.80993
1995	23.23693
2000	26.15159
2005	28.03348
2010	28.3769
2015	28.40571
2020	29.58082
2025	30.78514
2030	32.06946
2035	31.73601
2040	29.11537
2045	26.36475
2050	24.54168
2055	23.63107
2060	24.11969
2065	24.96155
2070	24.96711
2075	24.44863
2080	23.79678
2085	23.40457
2090	23.45177
2095	23.76955
2100	23.95044