Nielsen has tracked television ratings for all summer and winter Olympic Games broadcasts since 1968.
Ratings data for Olympic Games telecasts from 1968 to 2006 — including ratings for opening and closing ceremonies and average ratings for each Olympics — are available below:
-Average Ratings: all Summer and Winter Olympics telecasts, broken out by daypart (3.36MB)
-Ratings for Opening and Closing Ceremonies: Summer Olympics
-Ratings for Opening and Closing Ceremonies: Winter Olympics