data
| Date | L日 | L晚 | L夜 |
|---|---|---|---|
| dB | dB | dB | |
| 2021-Q4 | 75.2 | 72.7 | 69.8 |
| 2021-Q3 | 74.9 | 70.8 | 69.8 |
| 2021-Q2 | 76.1 | 73.6 | 69.4 |
| 2021-Q1 | 75.4 | 72.2 | 69.6 |
| 2020-Q4 | 75.6 | 73.3 | 68.7 |
| 2020-Q3 | 75.6 | 72.3 | 68.2 |
| 2020-Q2 | 75.0 | 73.5 | 69.7 |
| 2020-Q1 | 75.7 | 72.9 | 68.1 |
| 2019-Q4 | 75.7 | 73.7 | 69.1 |
| 2019-Q3 | 75.5 | 72.1 | 68.8 |
| 2019-Q2 | 75.8 | 73.1 | 69.4 |
| 2019-Q1 | 75.3 | 73.2 | 69.9 |
| 2018-Q4 | 74.7 | 73.0 | 66.9 |
| 2018-Q3 | 74.8 | 70.5 | 67.7 |
| 2018-Q2 | 75.7 | 72.1 | 68.9 |
| 2018-Q1 | 75.1 | 71.7 | 68.6 |
| 2017-Q4 | 66.9 | 64.2 | 59.5 |
| 2017-Q3 | 67.7 | 65.0 | 60.3 |
| 2017-Q2 | 75.3 | 73.8 | 69.2 |
| 2017-Q1 | 74.7 | 71.8 | 68.4 |
| 2016-Q4 | 77.2 | 70.5 | 71.1 |
| 2016-Q3 | 72.1 | 66.1 | 65.9 |
| 2016-Q2 | 73.2 | 70.4 | 67.1 |
| 2016-Q1 | 69.3 | 66.9 | 63.2 |
| 2015-Q4 | 77.1 | 74 | 71.0 |
| 2015-Q3 | 75.7 | 72.5 | 68.8 |
| 2015-Q2 | 73.1 | 71.1 | 66.7 |
| 2015-Q1 | 72.4 | 66.1 | 65.9 |
| 2014-Q4 | 76.8 | 73.9 | 70.2 |
| 2014-Q3 | 72 | 70 | 69 |
| 2014-Q2 | 69 | 71 | 68.7 |
| 2014-Q1 | 73 | 72 | 68 |
| 2013-Q4 | 74.4 | 73.1 | 68.5 |
| 2013-Q2 | 74.9 | 72.3 | 67 |
| 2013-Q1 | 75.9 | 73.1 | 70.1 |