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| colspan="13" | - || 3.4% || colspan="3" | -

|align="left"| Parti Demokratik Sosial (SDP) Shakai Minshutō

| colspan="12" | - || 2.2% || 3.8% || 2.9% || 1.5% || 1.9%

|align="left"| Parti Sosialis Demokratik (DSP) Minshatō

| 8.8 % || 7.4 % || 7.4 % || 7.7 % || 7.0% || 6.3% || 6.8% || 6.6% || 7.3% || 6.4% || 4.8% || 3.5% || colspan="5" |