Year	Percent
1950	10.70606
1955	12.0186
1960	12.65333
1965	13.00937
1970	13.42071
1975	13.65164
1980	12.87889
1985	11.90604
1990	11.7787
1995	11.67532
2000	11.23135
2005	9.62991
2010	8.04177
2015	7.26452
2020	7.43041
2025	8.48589
2030	8.00539
2035	7.22997
2040	6.44544
2045	5.98081
2050	5.95393
2055	6.10387
2060	6.113
2065	5.88063
2070	5.53733
2075	5.29564
2080	5.23435
2085	5.27894
2090	5.30498
2095	5.24217
2100	5.11065