Year	Percent
1950	13.06353
1955	13.18057
1960	13.34581
1965	12.20295
1970	10.52295
1975	10.01779
1980	9.27405
1985	8.96063
1990	8.58992
1995	8.69423
2000	7.6871
2005	7.16604
2010	7.5027
2015	6.92459
2020	6.5926
2025	6.27865
2030	5.94053
2035	5.67172
2040	5.52388
2045	5.4351
2050	5.32781
2055	5.19281
2060	5.06395
2065	4.95682
2070	4.88443
2075	4.84374
2080	4.80739
2085	4.76458
2090	4.71248
2095	4.66644
2100	4.62883