Year	Percent
1950	21.72866
1955	22.65363
1960	22.49204
1965	22.62807
1970	23.01994
1975	23.42463
1980	23.12088
1985	22.66844
1990	22.53676
1995	22.51915
2000	24.47026
2005	26.49184
2010	28.02713
2015	30.22991
2020	31.48832
2025	30.58635
2030	28.32424
2035	25.22622
2040	22.04205
2045	20.98575
2050	21.58711
2055	22.16653
2060	22.69996
2065	22.43185
2070	21.52687
2075	21.17014
2080	21.21451
2085	21.52871
2090	21.7822
2095	21.74432
2100	21.41566