请问最近的投资收益率是多少？
当期参考收益率百分之三点四五五四。[{'character': '当', 'pinyin': 'dang1', 'highest pitch': 10.36, 'lowest pitch': 9.67, 'duration': 0.23, 'prosody hierarchy': 'null'}, {'character': '期', 'pinyin': 'qi1', 'highest pitch': 10.06, 'lowest pitch': 9.61, 'duration': 0.23, 'prosody hierarchy': '#1'}, {'character': '参', 'pinyin': 'can1', 'highest pitch': 10.97, 'lowest pitch': 9.61, 'duration': 0.26, 'prosody hierarchy': 'null'}, {'character': '考', 'pinyin': 'kao3', 'highest pitch': 10.92, 'lowest pitch': 5.96, 'duration': 0.19, 'prosody hierarchy': '#1'}, {'character': '收', 'pinyin': 'shou1', 'highest pitch': 8.97, 'lowest pitch': 6.24, 'duration': 0.18, 'prosody hierarchy': 'null'}, {'character': '益', 'pinyin': 'i4', 'highest pitch': 8.76, 'lowest pitch': 7.02, 'duration': 0.13, 'prosody hierarchy': 'null'}, {'character': '率', 'pinyin': 'lv4', 'highest pitch': 8.31, 'lowest pitch': 5.21, 'duration': 0.26, 'prosody hierarchy': '#3'}, {'pinyin': 'sp1', 'highest pitch': 0.0, 'lowest pitch': 0.0, 'duration': 0.1}, {'character': '百', 'pinyin': 'bai3', 'highest pitch': 8.02, 'lowest pitch': 6.33, 'duration': 0.19, 'prosody hierarchy': 'null'}, {'character': '分', 'pinyin': 'fen1', 'highest pitch': 8.62, 'lowest pitch': 6.33, 'duration': 0.16, 'prosody hierarchy': 'null'}, {'character': '之', 'pinyin': 'zhiii1', 'highest pitch': 9.14, 'lowest pitch': 8.22, 'duration': 0.2, 'prosody hierarchy': '#1'}, {'character': '三', 'pinyin': 'san1', 'highest pitch': 10.55, 'lowest pitch': 10.3, 'duration': 0.27, 'prosody hierarchy': 'null'}, {'character': '点', 'pinyin': 'dian3', 'highest pitch': 9.9, 'lowest pitch': 4.84, 'duration': 0.24, 'prosody hierarchy': '#2'}, {'character': '四', 'pinyin': 'sii4', 'highest pitch': 10.16, 'lowest pitch': 6.12, 'duration': 0.21, 'prosody hierarchy': 'null'}, {'character': '五', 'pinyin': 'u2', 'highest pitch': 9.93, 'lowest pitch': 7.43, 'duration': 0.15, 'prosody hierarchy': '#1'}, {'character': '五', 'pinyin': 'u3', 'highest pitch': 9.87, 'lowest pitch': 4.13, 'duration': 0.2, 'prosody hierarchy': 'null'}, {'character': '四', 'pinyin': 'sii4', 'highest pitch': 10.16, 'lowest pitch': 7.04, 'duration': 0.34, 'prosody hierarchy': '#4'}]