The initial 737-100 made its first flight in April 1967, so your number is for a nearly 50-year period, making three and change per year average lost. It has been in service over 20 years longer than the A320. Total production is 8,385 as of January 2015. All variants [-300, -400, -500, and NextGen -600, -700, -800, and -900ER models]
The first member of the A320 family was launched in March 1984, first flew on 22 February 1987, and was first delivered in March 1988. Total production so far is 6,452 as of 28 February 2015.
As a percentage of airframes built, the 737 has lost 0.019% of aircraft. The A320 has lost 0.004% of the total aircraft built True, but when you consider the fact that the 737 has been in production for 20 years longer than the A320 series, the safety of both aircraft is pretty similar.
With that said, I'd fly in a Boeing jet ANY DAY over an Airbus.