Hoping to recover from their first loss of the season at Indianapolis, the Broncos returned home for an interconference match against the Washington Redskins. A 6-yard touchdown pass from quarterback Peyton Manning to wide receiver Wes Welker gave the Broncos the early lead. The Redskins tied the game just before halftime, with quarterback Robert Griffin III connecting on a 7-yard touchdown pass to wide receiver Leonard Hankerson. Early in the third quarter, the Redskins grabbed a 21-7 lead, with two touchdowns in only 19 seconds &#8212; both off Manning turnovers. Following a Manning fumble, Redskins' running back Alfred Morris rushed for a 1-yard touchdown. On the first play of the Broncos' next possession, Manning was intercepted by cornerback DeAngelo Hall, who returned the football 26 yards for a touchdown. However, the Broncos would score the final 38 points of the game. Midway through the third quarter, running back Montee Ball rushed for a 4-yard touchdown. At the beginning of the fourth quarter, Manning connected on a 1-yard touchdown pass to tight end Joel Dreessen to tie the game at 21-21. The Redskins' offense went three-and-out on their next possession, and after punter Sav Rocca shanked a punt to the Redskins' 35-yard line, the Broncos immediately grabbed the lead on the first play of their next possession, with Manning throwing a 35-yard touchdown pass to running back Knowshon Moreno on a screen play. On the Redskins' next possession, Broncos' linebacker Von Miller forced a fumble off RGIII deep in Redskins' territory, though the Broncos had to settle on a 19-yard field goal by placekicker Matt Prater. Midway through the fourth quarter, Manning threw his fourth touchdown pass of the game &#8212; a 35-yarder to wide receiver Demaryius Thomas. The final scoring play of the game came courtesy of cornerback Dominique Rodgers-Cromartie returning an interception off Redskins' quarterback Kirk Cousins 75 yards for a touchdown. This was Redskins' head coach Mike Shanahan's first visit to Denver since being fired by the Broncos after the 2008 season. Shanahan, who coached the Broncos from 1995-2008, is the winningest head coach in Broncos' franchise history, with 146 wins.
Question: How many years did Shanahan coach the Broncos?
Answer: 13