Year	Percent
1950	12.77821
1955	12.51298
1960	13.52421
1965	14.06004
1970	14.46967
1975	15.17295
1980	15.38355
1985	14.06588
1990	11.66726
1995	11.23708
2000	11.20363
2005	10.79606
2010	9.33943
2015	7.68327
2020	6.34598
2025	6.09091
2030	5.86979
2035	5.59074
2040	5.30638
2045	4.9872
2050	4.69372
2055	4.53347
2060	4.49073
2065	4.48915
2070	4.46648
2075	4.41868
2080	4.37788
2085	4.38492
2090	4.43864
2095	4.50713
2100	4.56352