American
   Year     SSN
    1945    32.3
    1946    99.9
    1947   170.9
    1948   166.6
    1949   174.1
    1950   103.7
    1951    64.4
    1952    30.5
    1953    12.5
    1954     3.4
    1955    34.6
    1956   125.9
    1957   168.3
    1958   172.1
    1959   145.0
    1960   102.1
    1961    44.7
    1962    29.8
    1963    22.2
    1964     7.4
    1965    12.1
    1966    38.7
    1967    86.3
    1968    97.5
    1969   104.6
    1970   107.4
    1971    66.5
    1972    67.3
    1973    36.7
    1974    32.3
    1975    14.4
    1976    11.6
    1977    26.0
    1978    86.9
    1979   145.8
    1980   149.1
    1981   146.5
    1982   114.8
    1983    64.7
    1984    43.5
    1985    16.2
    1986    11.0
    1987    29.0
    1988   100.9
    1989   162.2
    1990   145.1
    1991   144.3
    1992    93.5
    1993    54.5
    1994    31.0
    1995    18.2
    1996     8.4
    1997    20.3
    1998    61.6
    1999    96.1
    2000   123.3
    2001   123.3
    2002   109.4
    2003    65.9
    2004    43.3
    2005    30.2
    2006    15.4
    2007     7.9
    2008     2.4
    2009     2.8
    2010    15.6
    2011    50.1
    2012    52.8
    2013    60.7
    2014    74.7
    2015    46.1
    2016    25.5
    2017
    2918
    2019
    2020