Berkshire Hathaway's Stock Price

Compound Annual Growth Rate from 1990 to 1996 approximately: 26%

Compound Annual Growth Rate from 1996 to 2000 approximately: 18%

Compound Annual Growth Rate from 2001 to 2005 approximately
(still positive CAGR but well below Buffett's goal of 15%): 4%

Compound Annual Growth Rate from 2006 to Mid 2008 approximately: 31%
Berkshire Hathaway played a serious game of catchup during this short time frame.

Compound Annual Growth Rate from 1990 to Mid 2008 approximately: 17%
Berkshire Hathaway has exceeded the goal of 15% CAGR over a 17.5 year period.

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Of course there are some companies that exceeded 100% CAGR on their stock price during the 1990's.

It is interesting to note that RedHat (ticker: RHT) had more than a 14000% CAGR from August 11, 1999 until December 9, 1999 when the share price went from $54.50 to $286.25.
Of course it also had a very bad CAGR of -89% from December 9, 1999 until September 18, 2001.
During this time the stock had a 2 for 1 stock split on January 10, 2000. On a split adjusted basis, the stock went from $143.12 to $3.02 per share.