对给定的英文文本进行词频统计，并输出包含前10个最常出现的单词及其出现次数的字典。


"This is a sample text for word frequency analysis. The purpose of this text is to demonstrate how to count the frequency of individual words in a given text."
{"the": 2, "of": 2, "this": 2, "word": 2, "frequency": 2, "is": 1, "a": 1, "sample": 1, "text": 1, "for": 1}