bar graph below to answer the following question. A bar graph with 6 bars is titled "World Lead and Zinc Production". The horizontal axis is labeled "Year" and the vertical axis is labeled "Metric tons". Vertical bars extend from the horizontal axis. A key is given with "Lead" beside a blue square and "Zinc" beside a green square. Two bars, one green and one blue, are associated with each year value. Each bar's year, color, and approximate height are as follows. 1990, blue, 3,200,000 1990, green, 7,000,000 2000, blue, 3,000,000 2000, green, 8,800,000 2015, blue, 5,000,000 2015, green, 13,200,000 Zinc and lead are two commonly used metals. A zinc coating stops steel and iron from rusting, and zinc is combined with copper to form brass. Lead is used in batteries and in aprons to shield patients during X-rays. Between which two years did the production of lead decrease? 1990 and 2000 2000 and 2015