The pay for a Cadet was set at 1/2 the pay of a Second Lieutenent with less than two years of service.  When we entered the Academy as New Cadets the rate for a 2LT was set at $222.30.  It had been at that level since the pay schedule posted in May 1952.  Shortly after graduation (1 September 1965) a new pay schedule was published and 2LTs got their first pay raise is 13 years -- a wooping $72.30 per month (a 32.5% pay increase).  This was the largest single pay increase (percentage wise) in the post-war era.  The next highest was in 1971 with a 17.8% increase ($80.10).  The annual average increase in pay for a 2LT from 1970 to 2010 was 5.2%.  The two accompanying charts show the actual pay increases over time and the percent increase with each new published pay scale.

You can look up all the pay scales starting in 1949 through 2011 at this website.
http://www.military.com/benefits/military-pay/charts/historical-military-pay-rates.html?comp=7000022859188&rank=2