Year	Percent
1950	16.29231
1955	16.07538
1960	15.84161
1965	15.33305
1970	14.96716
1975	14.05866
1980	13.03216
1985	12.36134
1990	12.11012
1995	12.5741
2000	13.37134
2005	14.12012
2010	14.5793
2015	15.10473
2020	15.86403
2025	16.71196
2030	18.12389
2035	19.81618
2040	21.07259
2045	21.80891
2050	22.16299
2055	22.75328
2060	23.45589
2065	24.24674
2070	24.83545
2075	24.8637
2080	24.83146
2085	24.85703
2090	24.93674
2095	24.97272
2100	24.88882