请回答我的问题并用json格式输出答案：在2001年至2010年间，哪三个国家在夏季奥运会上获得金牌数最多？
user
{
    "years": "2001-2010",
    "event": "Summer Olympics",
    "top_countries": [
        {
            "rank": 1,
            "country": "China",
            "gold_medals": 204
        },
        {
            "rank": 2,
            "country": "United States",
            "gold_medals": 174
        },
        {
            "rank": 3,
            "country": "Russia",
            "gold_medals": 104
        }
    ]
}
assistant