data
| Date | L，LF日 | L，LF晚 | L，LF夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 32.2 | 28.0 | 27.2 |
| 2021-Q3 | 31.4 | 26.6 | 32.0 |
| 2021-Q2 | 29.7 | 24.8 | 24.1 |
| 2021-Q1 | 31.0 | 26.9 | 25.5 |
| 2020-Q4 | 33.1 | 28.3 | 26.5 |
| 2020-Q3 | 37.6 | 30.4 | 30.7 |
| 2020-Q2 | 31.9 | 26.4 | 27.7 |
| 2020-Q1 | 33.4 | 32.6 | 31.8 |
| 2019-Q4 | 34.0 | 29.5 | 30.2 |
| 2019-Q3 | 34.1 | 29.7 | 30.4 |
| 2019-Q2 | 32 | 28 | 29.8 |
| 2019-Q1 | 34.2 | 31.2 | 33.8 |
| 2018-Q4 | 33.8 | 26.6 | 28.5 |
| 2018-Q3 | 36.8 | 32.1 | 29.1 |
| 2018-Q2 | 30.5 | 29.9 | 31.0 |
| 2018-Q1 | 33.5 | 29.9 | 28.2 |
| 2017-Q4 | 34.0 | 31.3 | 33.1 |
| 2017-Q3 | 49.3 | 34.6 | 34.9 |
| 2017-Q2 | 48.3 | 31.8 | 30.5 |
| 2017-Q1 | 44.5 | 27.4 | 26.9 |
| 2016-Q4 | 53.2 | 36.5 | 35.8 |
| 2016-Q3 | 46.4 | 30.5 | 31 |
| 2016-Q2 | 46.4 | 30.5 | 31 |
| 2016-Q1 | 51.8 | 37.7 | 32.8 |
| 2015-Q4 | 49.7 | 32.3 | 31.4 |
| 2015-Q3 | 47.9 | 35.0 | 32.3 |
| 2015-Q2 | 49.0 | 46.4 | 33.6 |
| 2015-Q1 | 48.2 | 43.8 | 32.7 |
| 2014-Q4 | 54.0 | 48.3 | 43.0 |
| 2014-Q3 | 56.5 | 49.7 | 41.0 |
| 2014-Q2 | 53.8 | 46.5 | 40.7 |
| 2014-Q1 | 55.6 | 50.1 | 42.4 |
| 2013-Q4 | 41.8 | 34.6 | 34.3 |
| 2013-Q3 | 39.1 | 32.5 | 32.3 |
| 2013-Q2 | 41.8 | 35.4 | 34.6 |
| 2013-Q1 | 41.0 | 34.5 | 34.2 |