Year	Percent
1950	12.83046
1955	13.54924
1960	14.17416
1965	14.10664
1970	14.24222
1975	13.2976
1980	12.32267
1985	12.16518
1990	11.93298
1995	10.69894
2000	9.63521
2005	9.057
2010	8.04068
2015	7.07909
2020	6.66632
2025	6.20087
2030	5.75284
2035	5.37091
2040	5.07396
2045	4.8407
2050	4.66541
2055	4.54881
2060	4.44918
2065	4.36948
2070	4.31614
2075	4.28629
2080	4.28405
2085	4.2973
2090	4.31062
2095	4.32026
2100	4.33377