2009 - 1929 = 80
2011 - 1929 = 82
1929 - 1947 = -18
The answer is 1929.
2013 minus 1958 = 55
1,993 minus 2,013 is -20.
2,013 minus 1,919 is 94.
2,013 minus 1,727 is 286.
2,013 minus 30 is 1,983.
2,013 minus 1,912 is 101.
1,956 minus 2,013 is -57.
2,013 minus 1,956 is 57.