Financial report context:
for fiscal year 2005 , the effective tax rate includes the impact of $ 11.6 million tax expense associated with repatriation of approximately $ 185.0 million of foreign earnings under the provisions of the american jobs creation act of 2004 . for fiscal year 2004 , the effective tax rate reflects the tax benefit derived from higher earnings in low-tax jurisdictions . during fiscal year 2006 , primarily due to a tax accounting method change , there was a decrease of $ 83.2 million in the current deferred tax assets , and a corresponding increase in non-current deferred tax assets . in the third quarter of fiscal year 2006 , we changed our tax accounting method on our tax return for fiscal year 2005 with respect to the current portion of deferred revenue to follow the recognition of revenue under u.s . generally accepted accounting principles . this accounting method change , as well as other adjustments made to our taxable income upon the filing of the fiscal year 2005 tax return , resulted in an increase in our operating loss ( nol ) carryforwards . in may 2006 , the tax increase prevention and reconciliation act of 2005 was enacted , which provides a three-year exception to current u.s . taxation of certain foreign intercompany income . this provision will first apply to synopsys in fiscal year 2007 . management estimates that had such provisions been applied for fiscal 2006 , our income tax expense would have been reduced by approximately $ 3 million . in december 2006 , the tax relief and health care act of 2006 was enacted , which retroactively extended the research and development credit from january 1 , 2006 . as a result , we will record an expected increase in our fiscal 2006 research and development credit of between $ 1.5 million and $ 1.8 million in the first quarter of fiscal 2007 . revision of prior year financial statements . as part of our remediation of the material weakness in internal control over financial reporting identified in fiscal 2005 relating to accounting for income taxes we implemented additional internal control and review procedures . through such procedures , in the fourth quarter of fiscal 2006 , we identified four errors totaling $ 8.2 million which affected our income tax provision in fiscal years 2001 through 2005 . we concluded that these errors were not material to any prior year financial statements . although the errors are not material to prior periods , we elected to revise prior year financial statements to correct such errors . the fiscal periods in which the errors originated , and the resulting change in provision ( benefit ) for income taxes for each year , are reflected in the following table : year ended october 31 ( in thousands ) .

Financial table:
2001: $ 205; 2002: $ 1833; 2003: $ 5303; 2004: $ -748 ( 748 ); 2005: $ 1636

Additional report context:
the errors were as follows : ( 1 ) synopsys inadvertently provided a $ 1.4 million tax benefit for the write- off of goodwill relating to an acquisition in fiscal 2002 ; ( 2 ) synopsys did not accrue interest and penalties for certain foreign tax contingency items in the amount of $ 3.2 million ; ( 3 ) synopsys made certain computational errors relating to foreign dividends of $ 2.3 million ; and ( 4 ) synopsys did not record a valuation allowance relating to certain state tax credits of $ 1.3 million . as result of this revision , non-current deferred tax assets decreased by $ 8.1 million and current taxes payable increased by $ 0.2 million . retained earnings decreased by $ 8.2 million and additional paid in capital decreased by $ 0.1 million . see item 9a . controls and procedures for a further discussion of our remediation of the material weakness . tax effects of stock awards . in november 2005 , fasb issued a staff position ( fsp ) on fas 123 ( r ) -3 , transition election related to accounting for the tax effects of share-based payment awards . effective upon issuance , this fsp describes an alternative transition method for calculating the tax effects of share-based compensation pursuant to sfas 123 ( r ) . the alternative transition method includes simplified methods to establish the beginning balance of the additional paid-in capital pool ( apic pool ) related to the tax effects of employee stock based compensation , and to determine the subsequent impact on the apic pool and the statement of cash flows of the tax effects of employee share-based compensation .

Question: what is the variation observed in the resulting change in provision for income taxes caused by errors during 2002 and 2001?
Answer: 1628