How many albums did the Grateful Dead release in 1981?
2
3
3
3
4
3
2
4
3
2
4
3
2
4
3
2
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
1
5
4
3
2
6
1
5
4
3
2
6
1
5
4
3
2
6
1
5
4
7
3
2
6
1
5
4
7
2
6
1
5
4
7
2
6
0
1
5
4
7
2
6
1
5
7
8
6
1
5
7
8
6
1
5
7
8
6
9
1
5
7
8
11
6
9
1
7
8
11
6
9
7
8
11
6
9
10
7
8
11
6
9
10
7
8
11
12
6
9
10
7
13
8
11
12
6
9
10
7
13
8
11
12
6
9
10
7
13
8
11
12
6
9
10
7
13
8
11
12
6
9
10
7
13
8
11
12
6
9
10
62
66
63
132
144
102
57
61
58