Samples | MLD | NP | PNA | NOI | SOI |
| March 1994 | 40 | 1012.37 | 0.23 | −1.00 | −1.10 |
| October 1995 | 35 | 1012.92 | 0.11 | 1.31 | 0.00 |
| February 1996 | 35 | 1007.99 | −0.70 | −3.87 | 0.40 |
| March 1996 | 0 | 1010.94 | −0.75 | −1.12 | 1.90 |
| July 1996 | 9 | 1018.22 | 0.18 | 0.02 | 1.10 |
| August 1996 | 0 | 1018.09 | −0.93 | 0.94 | 1.20 |
| March 1997 | 40 | 1014.99 | −1.56 | 2.00 | −0.70 |
| July 1997 | 20 | 1015.95 | 0.10 | −0.97 | −1.20 |
| March 1998 | 50 | 1008.11 | 0.69 | −3.58 | −4.00 |
| August 1998 | 0 | 1018.76 | −0.60 | 1.58 | 1.90 |
| November 1999 | 50 | 1011.32 | 0.45 | −2.03 | 1.70 |
| May 2001 | 14 | 1015.52 | −0.01 | −0.61 | −0.80 |
| July 2001 | 5 | 1017.41 | −0.36 | 0.53 | −0.30 |
| October 2001 | 30 | 1013.92 | −0.08 | 0.73 | −0.10 |
| February 2002 | 100 | 1010.13 | −0.11 | 2.94 | 1.80 |
| October 2004 | 30 | 1012.55 | −1.37 | −2.11 | −0.10 |
| February 2005 | 40 | 1008.07 | −0.11 | −5.40 | −5.20 |
| August 2006 | 10 | 1018.12 | −1.45 | −0.47 | −1.70 |
| March 2007 | 20 | 1012.74 | −0.12 | 5.11 | 0.30 |
| February 2008 | 22 | 1005.85 | 0.37 | 5.69 | 4.40 |
| May 2008 | 15 | 1014.14 | 1.25 | 0.57 | −0.10 |
| November 2008 | 35 | 1010.81 | 1.05 | 2.52 | 2.20 |
| March 2009 | 0 | 1017.40 | −1.29 | 4.57 | 0.70 |
| June 2009 | 10 | 1013.16 | 0.48 | −2.38 | 0.20 |
| September 2009 | 0 | 1013.60 | 1.03 | 1.42 | 0.50 |
| December 2009 | 50 | 1004.34 | 0.04 | −3.44 | −1.20 |
| MLD Spearman rs= | −0.69 | 0.22 | −0.27 | −0.30 | |