Year Number of women living alone (millions) Number of men living alone (millions) 1990 14.0 9.0
1995 14.6 10.1
2000 15.6 11.2
2005 17.3 12.8
2010 17.4 14.0

W(t)=0.19t+11.98
M(t)=0.25t+6.34
(W+M)(t)=0.44t+18.32
Let P(t) be the percentage of people living alone who are women at t years since 1980. Find an equation of P.
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