In 1980, the stadium was converted to 15,750 seating capacity, the following are average attendance numbers through the season, the number indicates the season ending year, this the first season is 1980-81:
81:
77.6%
82:
96.0%
83:
95.6%
84:
95.1%
85:
94.4%
86:
93.8%
87:
94.1%
88:
94.8%
89:
92.3%
90:
95.7%
91:
90.0%
92:
86.7%
93:
95.1%
94:
92.7%
95:
91.3%
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Now for reference on team record, here is how the team did in their division and in playoffs:
81:
4th,
lost first round
82:
4th,
lost Conference Finals
83:
4th, lost first round
84:
3rd,
lost second round
85:
2nd, lost Conference Finals
86:
1st,
lost first round
87:
4th,
lost second round
88:
5th, no playoffs
89:
5th, no playoffs
90:
5th, no playoffs
91:
5th, no playoffs
92:
5th, no playoffs
93:
2nd,
lost first round
94:
5th, no playoffs
95:
1st,
lost first round
The issue with the Nordiques was always stadium capacity, not fan attendance.
The new Nordiques capacity of 18,000+ should be an indication that the team will be able to compete quite extensively against other teams and with the NHL when the Nordiques come back.
Just in case some had doubts.