Year	Percent
1950	21.9665
1955	21.66259
1960	21.22684
1965	20.29442
1970	20.24036
1975	19.69738
1980	18.45894
1985	16.9379
1990	15.28609
1995	13.98645
2000	13.32736
2005	13.25897
2010	14.04046
2015	15.42959
2020	17.2029
2025	18.95116
2030	20.22823
2035	20.79645
2040	20.76964
2045	20.50058
2050	20.73956
2055	21.81549
2060	23.03449
2065	23.95982
2070	24.33634
2075	24.19009
2080	24.10297
2085	24.27092
2090	24.54714
2095	24.76044
2100	24.80748