Year	Percent
1950	8.0161
1955	7.23898
1960	7.21528
1965	7.49626
1970	8.12587
1975	8.86642
1980	10.47135
1985	11.28951
1990	14.83079
1995	16.35014
2000	17.49452
2005	19.18312
2010	21.48113
2015	24.76453
2020	28.45103
2025	32.82264
2030	36.96505
2035	40.24857
2040	41.40473
2045	41.5886
2050	42.19289
2055	40.98369
2060	40.75849
2065	41.14605
2070	41.94488
2075	41.38973
2080	41.67661
2085	41.95828
2090	42.35768
2095	43.01706
2100	43.58516