Year	Percent
1950	20.24301
1955	21.19983
1960	21.29051
1965	21.82528
1970	22.77651
1975	23.20316
1980	23.11982
1985	22.45527
1990	21.65218
1995	21.1668
2000	21.69403
2005	22.634
2010	23.00819
2015	23.64492
2020	24.05382
2025	23.89691
2030	24.32667
2035	24.7432
2040	24.79405
2045	25.08464
2050	24.93289
2055	24.38376
2060	23.94237
2065	23.70318
2070	23.52123
2075	23.30152
2080	23.02595
2085	22.71918
2090	22.45382
2095	22.25971
2100	22.11448