In which year did London's annual event "The Proms" reach 100 concerts for the first time?

"The Proms" or "BBC Proms", formally named the Henry Wood Promenade Concerts, is an eight-week summer season of daily orchestral classical music concerts and other events held annually, predominantly in the Royal Albert Hall in central London. The Proms were founded in 1895, and are now organised and broadcast by the BBC (British Broadcasting Corporation). Each season consists of concerts in the Royal Albert Hall, chamber music concerts at Cadogan Hall, additional Proms in the Park events across the UK on the "Last Night of the Proms".

In the 2009 season, which ran from 17 July to 12 September 2009, the total number of concerts reached 100 for the first time. The principal anniversary composers included:

George Frideric Handel (250th anniversary of his death)

Joseph Haydn (200th anniversary of his death)

Felix Mendelssohn (200th anniversary of his birth)

Henry Purcell (350th anniversary of his birth)

The humorist and music impresario Gerard Hoffnung was also remembered with the performance in the Last Night of Malcolm Arnold's "A Grand Grand Overture", which was commissioned for the first Hoffnung Music Festival. The 2009 Proms featured Bollywood music for the first time, as part of a day-long series of concerts and events also covering Indian classical music. The 2009 Proms included the 75th anniversary of the MGM film musical, and the 10th year of the West-Eastern Divan Orchestra.