Year	Percent
1950	11.8048
1955	13.16063
1960	12.1706
1965	12.09672
1970	12.22721
1975	12.50536
1980	11.90597
1985	13.63732
1990	13.63584
1995	12.64305
2000	12.28281
2005	12.32004
2010	12.12926
2015	12.08837
2020	12.08054
2025	11.47912
2030	10.66074
2035	10.12989
2040	9.81015
2045	9.54666
2050	9.22629
2055	8.83579
2060	8.40973
2065	8.03678
2070	7.71108
2075	7.43784
2080	7.16148
2085	6.88112
2090	6.60281
2095	6.34684
2100	6.12068