The output of steel this year has increased by 20% compared with that in 1992.今年钢产量比一九九二年增长了百分之二十。The city passed an ordinance restricting the size of advertising signs, but grandfathered all those signs erected before 1992.该城市通过了限制广告招牌大小的条例，但是一九九二年以前竖立的招牌不在此限。