Beyond strictly looking at wins and losses, DVOA by Football Outsiders gives a clear picture of team performance.
The following Infographic shows the past 10 years of DVOA rankings (2008-2017) for the San Francisco 49ers.
The four years of Jim Harbaugh's tenure as head coach clearly stands out as the only competitive stretch of the 49ers over the past decade. The hope for the 49ers is Kyle Shanahan can similarly get the team back into the playoffs.
Ten-Year DVOA Rankings: Arizona Cardinals, Atlanta Falcons, Baltimore Ravens, Buffalo Bills, Carolina Panthers, Chicago Bears, Cincinnati Bengals, Cleveland Browns, Dallas Cowboys, Denver Broncos, Detroit Lions, Green Bay Packers, Houston Texans, Indianapolis Colts, Jacksonville Jaguars, Kansas City Chiefs, Los Angeles Chargers, Los Angeles Rams, Miami Dolphins, Minnesota Vikings, New England Patriots, New Orleans Saints, New York Giants, New York Jets, Oakland Raiders, Philadelphia Eagles, Pittsburgh Steelers, Seattle Seahawks, Tampa Bay Buccaneers, Tennessee Titans, Washington Redskins