data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 54.0 | 45.8 | 45.4 |
| 2021-Q3 | 55.2 | 50.6 | 47.4 |
| 2021-Q2 | 54.5 | 43.3 | 43.8 |
| 2021-Q1 | 55.8 | 44.9 | 38.0 |
| 2020-Q4 | 50.2 | 46.8 | 45.5 |
| 2020-Q3 | 51.2 | 51.9 | 47.4 |
| 2020-Q2 | 51.9 | 51.9 | 47.4 |
| 2020-Q1 | 55.0 | 41.1 | 38.8 |
| 2019-Q4 | 55.5 | 42.2 | 46.0 |
| 2019-Q3 | 53.5 | 46.2 | 44.2 |
| 2019-Q2 | 52.1 | 48.1 | 45.4 |
| 2019-Q1 | 52.1 | 44.7 | 42.3 |
| 2018-Q4 | 52.1 | 46.1 | 43.2 |
| 2018-Q3 | 59.3 | 50.4 | 48.5 |
| 2018-Q2 | 51.7 | 44.8 | 44.4 |
| 2018-Q1 | 51.6 | 43.8 | 42.9 |
| 2017-Q4 | 47.3 | 45.5 | 45.3 |
| 2017-Q3 | 45.5 | 47.0 | 46.5 |
| 2017-Q2 | 49.1 | 53.7 | 49.4 |
| 2017-Q1 | 51.7 | 46.1 | 44.6 |
| 2016-Q4 | 55.1 | 46.7 | 47.7 |
| 2016-Q3 | 57.2 | 53.3 | 48.9 |
| 2016-Q2 | 54.7 | 52.1 | 49.1 |
| 2016-Q1 | 50.5 | 48.2 | 45.8 |
| 2015-Q4 | 54.2 | 48.3 | 46.5 |
| 2015-Q3 | 54.9 | 52.4 | 49.3 |
| 2015-Q2 | 58.7 | 54.5 | 48.4 |
| 2015-Q1 | 52.2 | 48.0 | 45.7 |
| 2014-Q4 | 52.5 | 49.8 | 48.2 |
| 2014-Q3 | 52 | 48 | 54 |
| 2014-Q2 | 48 | 53 | 46 |
| 2014-Q1 | 46 | 48 | 44 |
| 2013-Q4 | 52.1 | 49.7 | 47.7 |
| 2013-Q3 | 53.9 | 50.2 | 49.1 |
| 2013-Q2 | 56.9 | 54.4 | 49.7 |
| 2013-Q1 | 57.0 | 52.1 | 49.5 |