This task is about writing a correct answer for the reading comprehension task. Based on the information provided in a given passage, you should identify the shortest continuous text span from the passage that serves as an answer to the given question. Avoid answers that are incorrect or provides incomplete justification for the question.

Example input: Passage: The French and Indian War (17541763) was the North American theater of the worldwide Seven Years' War. The war was fought between the colonies of British America and New France, with both sides supported by military units from their parent countries of Great Britain and France, as well as Native American allies. At the start of the war, the French North American colonies had a population of roughly 60,000 European settlers, compared with 2 million in the British North American colonies. The outnumbered French particularly depended on the Indians. Long in conflict, the metropole nations declared war on each other in 1756, escalating the war from a regional affair into an intercontinental conflict. Question: When was the French and Indian War?
Example output: 1754-1763
Example explanation: It is a common convention to write (start year-end year) beside a historical event to understand when the event happened. We can observe a similar notation from the passage to conclude that the French and Indian War happened during 17541763. Therefore, the answer is 17541763.
Q: Passage: Israel is one of the world's technological leaders in water technology. In 2011, its water technology industry was worth around $2 billion a year with annual exports of products and services in the tens of millions of dollars. The ongoing shortage of water in the country has spurred innovation in water conservation techniques, and a substantial agricultural modernization, drip irrigation, was invented in Israel. Israel is also at the technological forefront of desalination and water recycling. The Ashkelon seawater reverse osmosis (SWRO) plant, the largest in the world, was voted 'Desalination Plant of the Year' in the Global Water Awards in 2006. Israel hosts an annual Water Technology Exhibition and Conference (WaTec) that attracts thousands of people from across the world. By 2014, Israel's desalination programs provided roughly 35% of Israel's drinking water and it is expected to supply 40% by 2015 and 70% by 2050. As of May 29, 2015 more than 50 percent of the water for Israeli households, agriculture and industry is artificially produced. As a result of innovations in reverse osmosis technology, Israel is set to become a net exporter of water in the coming years. Question: How much is Israel's water technology industry worth?
A:
$2 billion a year