Some Schools Mentioned, by Number of Recent Math Major (general) Graduates
Hamilton: 36
Swarthmore: 34
Bowdoin: 34
Amherst: 33
Vassar: 26
Williams: 23
Wesleyan: 22
Skidmore: 19
Lafayette: 16
Haverford: 15
Tufts: 15
Union: 10
Connecticut College: 4
In comparing schools of different sizes, you may want to normalize for enrollment. If considering this data in your decision, you will want to follow IPEDS for another year of data.
(Source: IPEDS.)