    Sentence t Forty to 50 yeors  ago... the ratio wos J to |.  Kessler said , ond 10 yeors ago.  it wos 2 tol.    Sentence & Forty to SO yeors  ago. the ratio wos about 3-to-|  . Kessler soid , and 10 years ago  . it wos about @-to-1.