A bond porfolio composition and spread durations of its components is listed in the table below:

Sector $\%$ of portfolio $(\%)$ Spread duration

Agencies $22\mathrm{.}95\mathrm{.}89$

Industrials $19\mathrm{.}18\mathrm{.}11$

Utilities $15\mathrm{.}94\mathrm{.}53$

Financials $18\mathrm{.}64\mathrm{.}88$

Treasury remainder $0\mathrm{.}00$

What is the portfolio's spread duration? EXCEL PLEASE