Year	Percent
1950	13.07711
1955	11.13287
1960	10.28213
1965	11.39804
1970	11.73782
1975	11.32667
1980	9.82827
1985	9.0995
1990	8.67139
1995	8.49757
2000	7.92601
2005	7.37838
2010	6.88853
2015	6.5959
2020	6.5911
2025	6.15285
2030	5.77695
2035	5.51155
2040	5.354
2045	5.23724
2050	5.15977
2055	5.07218
2060	4.96753
2065	4.87321
2070	4.81131
2075	4.78945
2080	4.78895
2085	4.78974
2090	4.78115
2095	4.7674
2100	4.75507