14 . capital stock and earnings per share we are authorized to issue 250 million shares of preferred stock , none of which were issued or outstanding as of december 31 , 2009 . the numerator for both basic and diluted earnings per share is net earnings available to common stockholders . the denominator for basic earnings per share is the weighted average number of common shares outstanding during the period . the denominator for diluted earnings per share is weighted average shares outstanding adjusted for the effect of dilutive stock options and other equity awards . the following is a reconciliation of weighted average shares for the basic and diluted share computations for the years ending december 31 ( in millions ) : .

Table:
 | 2009 | 2008 | 2007
weighted average shares outstanding for basic net earnings per share | 215.0 | 227.3 | 235.5
effect of dilutive stock options and other equity awards | 0.8 | 1.0 | 2.0
weighted average shares outstanding for diluted net earnings per share | 215.8 | 228.3 | 237.5
weighted average shares outstanding for basic net earnings per share 215.0 227.3 235.5 effect of dilutive stock options and other equity awards 0.8 1.0 2.0 weighted average shares outstanding for diluted net earnings per share 215.8 228.3 237.5 for the year ended december 31 , 2009 , an average of 14.3 million options to purchase shares of common stock were not included in the computation of diluted earnings per share as the exercise prices of these options were greater than the average market price of the common stock .
for the years ended december 31 , 2008 and 2007 , an average of 11.2 million and 3.1 million options , respectively , were not included .
during 2009 , we repurchased approximately 19.8 million shares of our common stock at an average price of $ 46.56 per share for a total cash outlay of $ 923.7 million , including commissions .
in april 2008 , we announced that our board of directors authorized a $ 1.25 billion share repurchase program which was originally set to expire on december 31 , 2009 .
in september 2009 , the board of directors extended this program to december 31 , 2010 .
approximately $ 211.1 million remains authorized for future repurchases under this plan .
15 .
segment data we design , develop , manufacture and market orthopaedic reconstructive implants , dental implants , spinal implants , trauma products and related surgical products which include surgical supplies and instruments designed to aid in surgical procedures and post-operation rehabilitation .
we also provide other healthcare-related services .
revenue related to these services currently represents less than 1 percent of our total net sales .
we manage operations through three major geographic segments 2013 the americas , which is comprised principally of the united states and includes other north , central and south american markets ; europe , which is comprised principally of europe and includes the middle east and africa ; and asia pacific , which is comprised primarily of japan and includes other asian and pacific markets .
this structure is the basis for our reportable segment information discussed below .
management evaluates reportable segment performance based upon segment operating profit exclusive of operating expenses pertaining to global operations and corporate expenses , share-based compensation expense , settlement , certain claims , acquisition , integration , realignment and other expenses , net curtailment and settlement , inventory step-up , in-process research and development write-offs and intangible asset amortization expense .
global operations include research , development engineering , medical education , brand management , corporate legal , finance , and human resource functions and u.s .
and puerto rico-based manufacturing operations and logistics .
intercompany transactions have been eliminated from segment operating profit .
management reviews accounts receivable , inventory , property , plant and equipment , goodwill and intangible assets by reportable segment exclusive of u.s .
and puerto rico-based manufacturing operations and logistics and corporate assets .
z i m m e r h o l d i n g s , i n c .
2 0 0 9 f o r m 1 0 - k a n n u a l r e p o r t notes to consolidated financial statements ( continued ) %%transmsg*** transmitting job : c55340 pcn : 060000000 ***%%pcmsg|60 |00007|yes|no|02/24/2010 01:32|0|0|page is valid , no graphics -- color : d| .

Question: what is the percent change in weighted average shares outstanding for basic net earnings per share between 2007 and 2009?
Answer: -9%
Calculation: subtract(215.0, 235.5), divide(#0, 235.5)