On March 29, 2016, in the last round of the match between China and Qatar in the World Cup Asian Top 40, the Chinese team defeated Qatar 2-0. If the goal difference of the Chinese team in this game is recorded as +2, then the goal difference of Qatar is recorded as how much.
2016年3月29日，在世界杯亚洲区40强赛最后一轮中国队与卡塔尔队的比赛中，中国队以2：0战胜卡塔尔队．若这场比赛中国队的净胜球记作+2，则卡塔尔的净胜球，记作多少．
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