Trends in IR: Domestic Politics?

I have a broken computer so I can't do much right now to address a silly assertion about the state of IR--that we have long ignored domestic politics.  A simple approach, given that I can't make any cool graphs right now, is to simply display one key variable over time--whether a work is "second level" or not.  That is, are the key independent variables focused on domestic political properties:

    Level2
year    No    Ye    Total
           
1980    52    81    133
1981    64    85    149
1982    49    93    142
1983    61    77    138
1984    51    75    126
1985    64    67    131
1986    40    101    141
1987    63    80    143
1988    65    64    129
1989    56    78    134
1990    58    74    132
1991    54    81    135
1992    54    95    149
1993    55    95    150
1994    52    91    143
1995    67    102    169
1996    54    101    155
1997    66    108    174
1998    51    123    174
1999    43    109    152
2000    46    101    147
2001    52    102    154
2002    46    119    165
2003    51    108    159
2004    41    128    169
2005    39    135    174
2006    46    144    190
2007    64    137    201
2008    61    127    188
2009    66    134    200
2010    71    147    218
2011    75    129    204
2012    83    155    238
           
Total    1,860    3,446    5,306

Note that the yes column is generally twice as much as every other kind of IR published in the major journals between 1980-2012.  Oops.