vertex pharmaceuticals incorporated notes to consolidated financial statements ( continued ) f .
marketable securities ( continued ) unrealized losses in the portfolio relate to various debt securities including u.s .
government securities , u.s .
government-sponsored enterprise securities , corporate debt securities and asset-backed securities .
for these securities , the unrealized losses are primarily due to increases in interest rates .
the investments held by the company are high investment grade and there were no adverse credit events .
because the company has the ability and intent to hold these investments until a recovery of fair value , which may be maturity , the company does not consider these investments to be other-than-temporarily impaired as of december 31 , 2006 and 2005 .
gross realized gains and losses for 2006 were $ 4000 and $ 88000 respectively .
gross realized gains and losses for 2005 were $ 15000 and $ 75000 , respectively .
gross realized gains and losses for 2004 were $ 628000 and $ 205000 , respectively .
g .
restricted cash at december 31 , 2006 and 2005 , the company held $ 30.3 million and $ 41.5 million respectively , in restricted cash .
at december 31 , 2006 and 2005 the balance was held in deposit with certain banks predominantly to collateralize conditional stand-by letters of credit in the names of the company 2019s landlords pursuant to certain operating lease agreements .
h .
property and equipment property and equipment consist of the following at december 31 ( in thousands ) : depreciation and amortization expense for the years ended december 31 , 2006 , 2005 and 2004 was $ 25.4 million , $ 26.3 million and $ 28.4 million , respectively .
in 2006 and 2005 , the company wrote off certain assets that were fully depreciated and no longer utilized .
there was no effect on the company 2019s net property and equipment .
additionally , the company wrote off or sold certain assets that were not fully depreciated .
the net loss on disposal of those assets was $ 10000 for 2006 , $ 344000 for 2005 and $ 43000 for 2004 .
i .
altus investment altus pharmaceuticals , inc .
( 201caltus 201d ) completed an initial public offering in january 2006 .
as of the completion of the offering , vertex owned 817749 shares of common stock and warrants to purchase 1962494 shares of common stock ( the 201caltus warrants 201d ) .
in addition , the company , as of the completion .

2006
2005
Furniture and equipment
$97,638
$98,387
Leasehold improvements
74,875
66,318
Computers
19,733
18,971
Software
21,274
18,683
Total property and equipment, gross
213,520
202,359
Less accumulated depreciation and amortization
151,985
147,826
Total property and equipment, net
$61,535
$54,533

furniture and equipment $ 97638 $ 98387 leasehold improvements 74875 66318 computers 19733 18971 software 21274 18683 total property and equipment , gross 213520 202359 less accumulated depreciation and amortization 151985 147826 total property and equipment , net $ 61535 $ 54533 .

Question: Analyse this data from a financial earnings document. what was the percent change in depreciation and amortization expense between 2004 and 2005?
Choices:
-0.00007
-0.07394
-0.07985
-0.06931
6.21831
Correct choice index: 1