Question: In which year did this annual international motor rally start that Clement Wilson wrote books on with jockey Richard Dunwoody?

Context paragraphs:
Deutsche Rallye Meisterschaft: The Deutsche Rallye Meisterschaft (occasionally German Rally Championship) was West Germany's and is Germany's leading domestic motor rally competition.  While having a background in dirt-surface off-road events the modern DRM is a tarmac rally competition, a condition it shares with Germany's World Rally Championship event Rallye Deutschland.

Australian International Motor Show: The Australian International Motor Show (AIMS) was an annual auto show held in Australia, alternating between the cities of Sydney and Melbourne.  Prior to the Sydney event in 2010, both cities previously hosted separate annual exhibitions.  Melbourne's version was known as the Melbourne International Motor Show, with Sydney hosting the Australian International Motor Show (known as the Sydney Motor Show prior to 2004).

Middle East Rally Championship: The Middle East Rally Championship (MERC) is a motor rally championship run under the auspicies of the FIA.  First held in 1984 the championship encompasses a series of rallies held across Western Asia.  The championship has featured long-running events like Rally of Lebanon, Rally Oman and the Troodos Rally in Cyprus as well as World Rally Championship event Jordan Rally.  Many of the rallies in the region pre-date national independence, mostly from the United Kingdom thus the championship could be seen as a legacy of British (and French in the case of Lebanon) colonialism.

Wales Rally GB: The Wales Rally GB is the largest and most high-profile motor rally in the United Kingdom.  It is a round of the FIA World Rally Championship and was formerly a round of the MSA British Rally Championship and is based in North Wales.  From its first running in 1932 until the 53rd event in 1997, it was known as the RAC Rally until adopting its current name in 2003 except in 2009 when it was Rally of Great Britain.

Clement Wilson (writer): Clement Wilson (born 11 May 1976) is a journalist, author and travel writer.  Born in Ireland, he was educated at Glenalmond College and Trinity College, Dublin and currently lives in Edinburgh.  His journalism has appeared in numerous newspapers and magazines and he has written books on the Gumball 3000 rally (with jockey Richard Dunwoody) and Iceland amongst other subjects.  He is a member of The British Guild of Travel Writers and the Chartered Institute of Journalists.

Gumball 3000: The Gumball 3000 is an annual British 3000 mi international celebrity motor rally which takes place on public roads.  It was started in 1999 by Maximillion Cooper, with the idea to combine cars, music, fashion and entertainment.

Zambia International Motor Rally: The Zambia International Motor Rally, also known as Safari Zambia and Zambia Rally, is an international rally racing event is organised by the Zambia Motorsports Association.  The rally is based in the Zambian capital of Lusaka and travels north of the capital to Chisamba for its competition stages.  The event is a round of the African Rally Championship and the Zambian Rally Championship.

World Cup Rally: The World Cup Rally was the name of two intercontinental motor rally competitions.  The event drew inspiration from the successful London-Sydney Marathon rallies, which had been held most recently in 1968.  Organised by Wylton Dickson, the World Cup Rallies were named for and celebrated the FIFA World Cup Association Football tournaments.  Each Rally started in London and raced to the World Cup host city; Mexico City in 1970 and Munich in 1974.  With Munich being relatively close to London, the rally was routed southwards into Africa, reaching as far south as Nigeria.

Rally Estonia: Rally Estonia (officially auto24 Rally Estonia) is a rallying event organised each year in Estonia.  It is the largest and most high profile motor rally in the country.  Rally Estonia runs on smooth gravel roads of Southern Estonia, the city of Tartu hosts the ceremonial start, a street stage on the opening night and the finish, while rally headquarters and service park are based in Otepää.  Since 2014, it is a round of the FIA European Rally Championship.

Richard Dunwoody: Thomas Richard Dunwoody MBE (born 18 January 1964 in Belfast, Northern Ireland) is a retired British jockey in National Hunt racing.  He was a three-time Champion Jockey, riding 1699 British winners in his career.  His father was a leading Point to Point rider.

Supporting paragraphs: Clement Wilson (writer) Gumball 3000
Answer: 1999