某项目财务现金流量表的数据见表1，则该项目的静态投资回收期为（ 　）年。表1  项目财务现金流量表 <table _dj="MsoNormalTable" border="1" cellpadding="0" cellspacing="0" width="593"><tbody><tr><td valign="top" width="117">计算期</td><td valign="top" width="31">0</td><td valign="top" width="42">1</td><td valign="top" width="49">2</td><td valign="top" width="55">3</td><td valign="top" width="55">4</td><td valign="top" width="55">5</td><td valign="top" width="55">6</td><td valign="top" width="55">7</td><td valign="top" width="78">8</td></tr><tr><td valign="top" width="117">净现金流量（万元）</td><td valign="top" width="31"> </td><td valign="top" width="42">-800</td><td valign="top" width="49">-1000</td><td valign="top" width="55">400</td><td valign="top" width="55">600</td><td valign="top" width="55">600</td><td valign="top" width="55">600</td><td valign="top" width="55">600</td><td valign="top" width="78">600</td></tr><tr><td valign="top" width="117">累计净现金流量（万元）</td><td valign="top" width="31"> </td><td valign="top" width="42">-800</td><td valign="top" width="49">-1800</td><td valign="top" width="55">-1400</td><td valign="top" width="55">-800</td><td valign="top" width="55">-200</td><td valign="top" width="55">400</td><td valign="top" width="55">1000</td><td valign="top" width="78">1600</td></tr></tbody></table>