Question: which year is the Baltimore Ravens season the franchise's 5th season in NFL and the second under head coach Brian Billick.

Context paragraphs:
2011 Baltimore Ravens season: The Baltimore Ravens season was the team's 16th in the National Football League and city of Baltimore, and the 14th to host home games at M&T Bank Stadium.  2011 marked one of the most successful seasons in Baltimore Ravens franchise history.  The Ravens completed the season with a 12–4 record, matching their record from 2010, and winning the AFC North division title for the third time in franchise history.  By earning a playoff berth in 2011, the Ravens set a franchise record by going to the postseason for four consecutive seasons.

2016 Baltimore Ravens season: The 2016 Baltimore Ravens season was the franchise's 21st season in the National Football League and the ninth under head coach John Harbaugh.  With a week 12 win over the Cincinnati Bengals, the Ravens improved upon their 5–11 record from 2015, finishing the season 8–8.  Despite the improvement, the Ravens failed to qualify for the playoffs for the second consecutive year after losing to the Steelers in Week 16.  It was the first time the Ravens missed the playoffs in consecutive seasons since 2004–2005.  They improved their position in the division, finishing in second place, after finishing in third place for the previous three seasons.  Since winning Super Bowl XLVII, they have gone a combined record of 32–34 (.484).

2009 Baltimore Ravens season: The 2009 Baltimore Ravens season was the franchise's 14th season as a team in the National Football League (NFL).  The franchise entered the season off an 11–5 record in their previous season, a playoff berth, but a loss in the American Football Conference (AFC) Championship game against the eventual Super Bowl XLIII champions, the Pittsburgh Steelers.  The Ravens recorded nine victories to seven losses, although they were unable to win the AFC North division title.  However, due to various playoff clinching scenarios in the AFC, the Ravens were able to clinch a wild card playoff berth against the New England Patriots, which they won.  They, however, lost in the AFC playoffs divisional round against the eventual AFC Champion Indianapolis Colts; with this loss, the 2009 season came to an end for the Ravens.  For head coach John Harbaugh, this was his second year with the franchise, compiling an overall record of 20–12 in the regular season.

1977 Baltimore Colts season: The 1977 Baltimore Colts season was the 25th season for the team in the National Football League (NFL).  The Colts finished the NFL's 1977 season with a record of 10 wins and 4 losses, and tied for first in the AFC East division with the Miami Dolphins.  However, the Colts finished ahead of Miami based on better conference record (9–3 to Dolphins' 8–4).  This season would mark the final season in which the Colts would make the playoffs as a Baltimore-based franchise (the Colts next appearance in the playoffs came 10 years later in 1987, by which time the team moved to Indianapolis).  Baltimore would not have a team in the playoffs again until the Baltimore Ravens advanced to Super Bowl XXXV, just over 23 years later.

2012 Baltimore Ravens season: The Baltimore Ravens season was the team's 17th season in the National Football League.  While the Ravens failed to improve on their 12–4 record from 2011, they did still manage to clinch the AFC North division title in Week 16 and finish the regular season with a 10–6 record, sending them to their fifth straight playoffs, where they advanced to the AFC Championship Game for the second consecutive season, and then to the Super Bowl for the first time since 2000.  They won their second Super Bowl victory, 34–31 against the 49ers.  It was the first time in franchise history that the Ravens won consecutive division titles.  This marks head coach John Harbaugh's fifth season as the head coach of the franchise and fifth consecutive post-season appearance.  The Ravens played their home games at M&T Bank Stadium.

2015 Baltimore Ravens season: The Baltimore Ravens season was the franchise's 20th season in the National Football League (NFL) and the eighth under head coach John Harbaugh.  Although picked by some, including "Sports Illustrated"'s Peter King, to reach the Super Bowl, they had a disappointing season in part due to injuries.  14 of their games were decided by 8 points or less and Joe Flacco, Justin Forsett, Steve Smith, Sr., and Terrell Suggs all suffered season ending injuries.  They were eliminated from playoff contention in Week 14 with a loss to the Seattle Seahawks, in which they also suffered their ninth loss, resulting their first losing season in the Harbaugh–Flacco era and first since the collapse of the Brian Billick era.  Ultimately the Ravens finished with a 5–11 record and twenty-two players ended the season on Injured Reserve.

2013 Baltimore Ravens season: The Baltimore Ravens season was the franchise's 18th season in the National Football League and the sixth under head coach John Harbaugh.  The Ravens entered the season as the defending Super Bowl champions from the previous year, but failed to improve on their 10–6 record from 2012, and missed the playoffs for the first time since 2007.  For the first time in franchise history, Ray Lewis was not on the roster, as he announced his retirement before the playoffs began the year prior.  Including Lewis, the team parted ways with a record eight starters from the Super Bowl-winning squad; no other defending Super Bowl champion had lost more than five.

2000 Baltimore Ravens season: The Baltimore Ravens season was the franchise's 5th season in the National Football League (NFL) and the second under head coach Brian Billick.

2001 Baltimore Ravens season: The Baltimore Ravens season was the franchise's 6th season in the National Football League (NFL) and the third under head coach Brian Billick.

Brian Billick: Brian Harold Billick (born February 28, 1954) is a former National Football League coach and commentator.  Billick spent nine seasons as head coach of the Baltimore Ravens from January 19, 1999 to December 31, 2007; he led the Ravens to a 34–7 victory over the New York Giants in Super Bowl XXXV, the franchise's first Super Bowl appearance.  He was also the offensive coordinator for the Minnesota Vikings (1994–1998) when they broke the scoring record in the 1998 season.

Supporting paragraphs: 1977 Baltimore Colts season 2000 Baltimore Ravens season
Answer: 1987