Year	Percent
1950	19.68473
1955	18.88911
1960	17.95673
1965	16.12603
1970	14.20498
1975	12.93534
1980	12.11595
1985	11.73498
1990	11.01235
1995	11.68308
2000	11.64818
2005	12.10966
2010	13.60233
2015	14.40667
2020	15.59943
2025	16.42979
2030	16.82333
2035	17.18386
2040	17.62681
2045	18.03651
2050	18.61
2055	19.38321
2060	20.0522
2065	20.70923
2070	21.20662
2075	21.54481
2080	21.91728
2085	22.32041
2090	22.69941
2095	23.02332
2100	23.27329