Year	Percent
1950	16.44518
1955	16.48607
1960	14.76216
1965	14.21426
1970	14.40678
1975	15.22212
1980	15.70866
1985	16.10547
1990	16.20693
1995	16.75994
2000	17.93334
2005	19.49989
2010	21.17006
2015	22.64768
2020	24.23369
2025	25.41231
2030	26.0685
2035	26.14095
2040	26.15507
2045	25.91478
2050	25.74908
2055	25.7316
2060	25.38386
2065	24.97034
2070	24.50692
2075	23.96334
2080	23.5026
2085	23.18581
2090	22.97582
2095	22.75925
2100	22.52439